Be very careful when shopping for speakers (especially on EBAY). I have done alot of research and shopping over the past few months and can attest that a speaker system seems to be one of those things in life where you get what you pay for (to a point). B&W makes great speakers. I have a CC6 center channel and like it. Be warned though that B&W speakers seem to have a much "smoother and mellow" sound than some of its competitors. I loved the CC6 when I first bought it, but after listening to a Klipsch Reference Series center channel speaker, I hate my CC6 now. Its all in your taste. I thought I would like the smooth, mellow B&W's until I realized that my tastes in music favor a more "in your face speaker system" like the Klipsch Reference Series with the loaded horn. I don't think you can go wrong with any of the popular mid-price brands including B&W (yes, they do make reasonably priced speakers), Definitive Technology (check out the new Power Monitors--AWESOME!!!), Jamo, Paradigm, Klipsch, Mirage, etc.
Whatever you do---LISTEN BEFORE YOU BUY!!!!!
Also check out SVS for subwoofers. They are nasty!!!