SS Amp Recommendations?

I need a newer amp and recommendations are appreciated. The parameters are these:

Used, but new as possible.

100 watts minimum, 2 channel. I have built my own speakers.

$500 maximum. This figure is due to our rotten economy and my tight fisted, Yankee cheapness. You can never tell what the future may bring with our bonkers economy. Money is an issue even with this hobby.

The music I listen to: All Rock (no G.D. rap!) , jazz, classical. Heavy emphasis on Frank Zappa, Jeff Beck, Pink Floyd, Al DiMeola you get the picture.

Again, I appreciate any comments even on my cheapness or choice in music too!