Very cheap, very small, sort of powerful 3 ch amp

I'm selling a Sunfire Cinema Grand, picking up a Krell 400xi and probably an Outlaw 990. I need a 3 channel amp mostly for movies, and occasionally for DVD-A and SACD. The surrounds are Vienna Acoustics Bachs and the center is a VA Maestro. These speakers seem to respond well to higher wattage, but more importantly I am looking for something used and low cost (maybe $500ish?) and small. This seems like a perfect application for a small digital amplifier--I just don't know of one. I'm selling the cinema grand because I don't need the extra channels and it will be too big when the new additions arrive. I really can't think of a single amp that fits my criteria and am looking for help.