Rockfish,
I own the 2200 which is the composer Pro. I believe the 2600 is the composer pro XL. I haven't had any experience with the newer model but i believe the 2200 is going to be the best deal. I picked one up off ebay for $45.
If you come across one, the older Behringer Composer is supposed to work good as well.
I don't remember what budget range your in but if its around $200 I would go pick up an FMR audio RNC (real nice compressor). Unless of course you need more than one channel at a time.