If you can find a used Wyred4Sound multi-channel amp, they are terrific. A new one would be about double your price range, however, and they don't come up used very often. If you do find one, however, they run cool and present a natural, balanced, dynamic, and very detailed sound. They also do a great job with timbre and soundstage. I have their integrated amp, not the multi-channel, but they are both built on the same uniquely modified ICE amp core.