I'll keep this short, since I've made a number of posts recently on this topic: check out the Bryston SP-1, if that's within your budget. For more info, see my posts over the past 6-8 weeks.
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Why not get something like a REL ST series sub (STratus, STorm, STadium, STentor, STudio) that are made for 2 channel music. They run off your amps speaker terminals, so no crossover, etc. They get the same signal as your main speakers, so they integrate perfectly. Then you can get whatever preamp and power amp is most musical with no compromises.