Loop Pedal

I'm with Russell.  I got the RC2 for $155 on ebay but now I see them in $85 - 100 range and it's a great practice partner.  You don't have to spend a lot, and it's best not to get too dependant.  You can always sell a boss for decent return if you want later.  They're bullet proof/

Crevs,

I've got the Digitech Jamman V1.O.  I had to buy the extra pedal that attaches to it in order to cycle through the stored patches without bending over.  Version 2.0 has that built in to it and should be exactly what you are looking for.  I am very fond of my Jamman even with the extra pedal.  Never had a problem with it.  However, looper pedals are very unforgiving of miss tapped foot inputs.  Practice with these alot before before performing live..

I've got a digitech RP355. Its a multi effects processor so it does all kinds of stuff and loops. I think the RP 155 loops and its only about $100. It only holds 20 seconds which isn't enough for a full 12 bar progression unless your blistering fast, but enough to get some chord changes going to solo over, and has helped me tremendously in that regards. It has lots of drum patterns but they dont work when the looper mode is on. A major oversight in my opinion. They also can be found on craigslist really cheap. You might also want to check for some freeware recording software. With my old multi tracker I could record something and then go  back and set points for it to loop.