Bwyoung is on the right track: I owned a pair of 4B-ST's and loved them ... until I heard my system with the 7B-ST's. The trade-up was a no-brainer for me since I enjoy a well defined bottom end and my speakers are tough to drive. Overall, the sound stage and "live" experience was better with the 7B's so I would forgo the bi-amping in favor of the better amps. Hope that helps.
Biamp w/2 Bryston4BST s or 1 14BSTw/B W?
I currently have the B&W Nautilus 803's with hopes on getting N802's in the future. Anyway, I'm uprgrading to better amps (Bryston) and wondered if it would be better to buy 2 Bryston 4BST's (total of 250W x 4) and biamp them (possibly vertically) or would it be more beneficial to just run a single Bryston 14BST (500W x 2) or 2 7BST's (same thing)? It is theoretically the same amount of power just distributed differently. Any thought?