Dan, you realize small and amplifiers are an oxymoron right? laugh

These are 2 channel amps that are small, to some what small.
http://www.accessories4less.com/make-a-s...mplifier/1.html

http://www.accessories4less.com/make-a-s...25-Watts/1.html

I think finding a 3 channel amp is going to be rough.. My 3 channel amp is the same size as my 2 channel.. Both are about the size of a receiver...

On other thing that you did not mention, was budget...