IMO the B & W speakers you are talking about are not nearly as well-balanced or good-sounding as the Model 685.

I suggest that you check out the online review of the 685 from "what hi-fi". Their reviews seem to be quite reliable and informative.

Another very good one is the Wharfedale Diamond 10.2.

I use the NHT B12D subwoofer which offers exceptionally clean bass quality (with no "boom" or unwanted resonances). Highly recommended.