This has been discussed a lot here in recent months. As many here already know, I use the Motion Sound KP-200s which would more than fit all of the requirements you have. It has lots of raw power and it has stereo direct outputs that can run to your band's mixer, plus you can take a monitor feed from the band and feed it into the "click input" of the KP-200s so it'll function as both your keyboard and vocal monitor amp at the same time. You can search through this forum for more comments but this seems to be one of the top compact stereo keyboard amps going today.
http://www.motion-sound.com/keypro_amplifiers.htm [This message has been edited by The Pro (edited 05-06-2003).]