I don' understand what you want, I am from Belgium, so my mother tongue is Dutch.
But about that RACK-MOUNTABLE HEAD.
You have a cabinet = the big BOX with speakers.
I thought that in my answer was written how great they are
- Line6 Spider III HD75 Guitar Amplifier Head (75 Watts) = $249.95
- Line6 Spider III HD150 Guitar Amplifier Head (2x75 Watts) = $399.95
Isn't this the answer? I looked around on the web, this was what I found.
Maybe you can surf to www.line6.com click on PRODUCTS, CLICK ON AMPS, you will find the SPIDER III in all her glory.
There 10 different LINE6 amps.         
- LINE6 CABINET: FEATURES:
    * Slant Cab with 4 – 12† Custom Celestion® Speakers
    * Designed for Spider III HD75 and Spider III HD150

I made it easier, and the next phrase you'll read is about a SPIDER III AMPHEAD
- there are TWO (2) AMPHEADS:
A HD 75 Watt
A HD 150 Watt and this is what they write.
THE SPIDERâ„¢ III delivers detailed amp models based on some of the greatest guitar sounds ever created. To keep these sounds authentic, we kidnapped some of our favourite artists to dial in each amp model.  Now you can rule the stage with the Insane model with its truly massive gain or explore your sensitive side in the studio with the Clean model.  It’s all up to you.
FEATURES:
    * 12 Custom Amp Models from Clean to Insane
    * 7 Smart Control FX (up to 3 simultaneous) including Tape Echo, Sweep Echo, Standard Delay (all with Tap Tempo) Chorus/Flanger, Phaser, Tremolo, and Reverb
    * 250 artist-created presets
    * 150 song-based presets
    * Plus 36 user programmable presets
    * Built-in front panel tuner
    * 150 Watts Stereo (75W x 2)
    * Dimensions: 26.4L x 9.25H x 10.75
I had the impression that my answer and all the extra information was correct.
So if this isn't the answer that I wrote you already + extra information about some other ampheads, also describing what I use, I really don't know WHAT I DID WRONG

BONE, thanks. This song is in fact an interpretation based on another song. PROBLEM: I always tell to use more simple chords, result: again "not so easy chords" and also the first TWO lines, are calm, but the next to a little bit different, same chords but MORE PASSION.
I am hoping to use asap my little recording device (BOSS BR 600). It worked, using 4 canals and a virtual, I played some "bluesy" riffs, starting in A, D, E. Next some bending strings based on E and finally some stuff in G and B. If you would here this together it's a real cacophonie, but that machine, pushing some  and sliding other stuff, I really don't know how, but this CACOPHONIE, was even pretty good, something with arrangements and virtual tracks, compressing it all into one entity. There was an English manual, but I found the Dutch translation. It took me 2 hours, and I am really impatient if I have to read manuals. I need to find how to add rhythm patterns. If it works, I will try to post it on myspace, just instrumental, 60 seconds.

YEEHA, I tricked you. I agree, I thought about it, not about a tune, melody I have a "head ful" of tunes, at least 100 different, and 50 sometimes similar to existing songs I heard on TV or Radio.
I think this happens all the time. JUST GO TO YOUTUBE, write PLAGIARISM and you will see & hear a lot of VERY similar almost IDENTICAL songs. I feel worse (PHYSICAL) and a lot of people notice this, I start thinking, also too much. I've had some really bad days, and this is so unfair. Because of thinking, fighting, writing and despite all my documents, I even get 160$ extra every month from the government, which is very uncommon, in stead of being happy, it really hurts, because it proves that my condition is really serious, also the fact that I really get a lot of money just for suffering and doing nothing. I lost everything, my girlfriend, an independent nurse who worked 7/7 days leaving at 05.30 to return at 22.30, she was EGOCENTRIC, she hated everyone who came to see me = big relieve. I lost my pride, my self-esteem, my work (=my life, but responsible for my private life where I failed a few times) I had the most beautiful women, my "joye de vivre", my courage, my social life=almost at home 24 hours a day. I am even not aware which day it is. It is a relieve when I compare this with a guy who runs his own business, renting DVD's living in fact just like me, every day is the same, add on top my RESTLESS MIND, giving me the opportunity to do 3 different things at the same time. THAT is really awful. I discovered the why, by doing an IQ test IN ENGLISH (www.tickle.com) and having 147 as IQ, add 20-25 in my language. This problem, and I can guarantee you, is/was killing me and is a curse and not a blessing. I started to understand a lot of events in my life, like being considered as a freak on school, able to memorise 200 pages (A4 size) a day, walking through a museum in 1 hour, and knowing more than a person who looked to everything in one day. Doing 4 things together, starting with A, but in stead of B, I am jumping from A to Z to return to A, giving the impression that I didn't listen, but knowing exactly what he told, always knowing and giving an answer on questions they wanted to ask. I don't know why I write this, but that's me and I can't controle it. My strongest point is also my weakest point. I am who I am, more assertive but at the same time more sensitive and not so self assured. That's me, also why I write long answers, or topics. I have nobody now, only CHORDIE, this site changed me a lot. Sorry for all this, and I will post songs, even using a lot of difficult but nice chords. YOU ARE ALL SO GREAT, NICE and REAL FRIENDS for me, or "cyber friends". It is a big relieve writing this, I just wannabe loved.

I am really scared when I change strings. Long time ago, I started with the little E-string, followed by a B-string and when trying to tune that guitar, the B snapped, and hit my face. It 's been 30 years ago, but even today, and having strings, I am scared. So maybe I should buy a tuning machine, you put it on the guitar head, on a string tuning knob, and it winds the string real automatic.

- Hillary Clinton = China Trill Only  Nail Inch Trolly  Nylon Chilli Rat

It's just a STOOPID (I prefer this in stead of STUPID.)
The melody is quit "catchy", but let 100 people play this melody, only a few play it as I do, and this is probably for all songs.
I really had fun too, finally, I could laugh with myself. That Ken was a relieve.
As you know my entire life is DOMINATED by that crash, and I make absolutely no progression. It gets worse. It's not funny to see your 77 years old mother crying, but never in front of me. She phones to my sisters, or brothers. They did surgery in September 2005, 6 weeks hospital, to put all the little bones in my left foot together, with the intention to block it, in a 90° position, I can't move this foot (before I could turn my foot 180°, so one foot toes pointing forwards, the other toes pointing backwards.) A 100% success, but, probably because of the surgery, it resulted in a free fall. My BIGGEST child dream, Doc on a cruise ship, was really the end. Accepted, but 1 month later rejected, they had the right to ask all medical information.
I am a skilled hypnotist too, if I want, or better could, I could earn a lot giving shows. Only problem= standing and look right in the eyes of sitting people= domination,in a wheelchair not.
I do have a song about this too. But I decided to STOP POSTING SONGS HERE because I really suck: melody & lyrics. You won't no longer see another song. Maybe on myspace, if I am able to work with my Boss BR 600.
These lyrics are stupid, this was my purpose AND a goodbye song. I continue to play, and improve THOSE skills. I know at least 50-70 chords, I can play these too, and I love switching.

- Line6 Spider Guitar Speaker Cabinet (150 Watts, 4x12 in.) $299.95 on www.Zzounds.com
List: $419.99 = the regular maximum price price
Line6 Spider III HD75 Guitar Amplifier Head (75 Watts) = $249.95
Line6 Spider III HD150 Guitar Amplifier Head (2x75 Watts) = $399.95
You can think about taking another amp head like: Marshall MG100HDFX 100 W = $349.95.
Factory comment: is best suited to the Celestion loaded MG412A (angled) and MG412B (straight) 120W 4x12 in. cabinets. Unbelievable tone, feel, and projection come as standard.
So about your cabinet you did well. Amp heads? As you see, the marshall is in between as is the price. If you can afford it, this one is a killer. If you love effects, distortion, that's the one, no floorboard effects needed.
- Line 6 Spider Valve 100HD 100W Guitar Amp Head = $799.99 on www.musiciansfriend.com.
As you see, a 150W should be great, if you perform somewhere, see and compare.
Do you like effects, a lot, look to some AMP HEADS or FLOORBOARDS.
My amps (3) are a
- Marshall Valvestate: price??? I have this one 12 years
- Marshall AS100D Acoustic Combo Amp 100W. I didn't want at all an acoustic 100W. I went for a 50W. I am a very good customer in the 2 major guitar stores, they know me, and what they tell is the truth, I played both, 20 seconds later: 100W I also use this amp a lot for my electrics.
- My TOP AMP: A Fender Cybertwin = hybrid amp, tubes and digital, too much effects, other amps (modeling), this baby blows you far away, just your shoes will be on their place. 2x75W
- EFFECTS: Line 6 PODXT live, I had a digitech (fantastic board) but I wanted the POD so bad that I traded the digirech. Still regret this. In fact all floor boards are less important, see cybertwin.
I hope you are able to choose, I knoww these amps, they rock.

AND THIS RIGHT FROM A BLOODY EUROPEAN WHO CAN'T SPEAK OR WRITE IN ENGLISH