we have B&W DM604's (and 601's, 601's and the lcr600 and the asw 600), but we have the 604's hooked up to a stereo integrated amp (a rotel RA-06) and it sounds really good, although, comparing to my advents, two 7" bass drivers can't do what a single 12" can...
apart from that, they are really good speakers, the 603's were good too, (I heard them once)...

exellent speakers in their priceclass, although you should also consider focal's, I think 716's will fit nicely in your budget... (i think)

I had a quick listen at wharfedale diamond 9.1's and they were really really warm...
good speakers for their money though, then you also have monitor audio, their entire Bronze range fits in your budget, and they're good speakers.

Good luck,
Bert.