Biamp w/2 Bryston4BST s or 1 14BSTw/B W?

By all accounts, a pair of 7b-st's is a better option than a pair of bridged 4b-st's (if, for no other reason, the fact that the 7's are single purpose monoblocks and the 4's are designed as stereo amps that can pull double-duty as monoblocks means that there is redundant or unnecessary circuitry in the 4's). Personall, however, I got a 4b-st because it fit into my budget at the time and I knew I could bridge it and get another one later on if and when it made sense to do so. Hence, it seems like the old incremental / convenience v. (maybe unnecessary) purity of design question. I can't say whether the 7's really do sound any better than a pair of 4's, but the convenience of being able to purchase and upgrade incrementally won out for me. That said, I have found the single 4b-st to be more than adequate for my use and am no longer even considering getting another one. I do like Bryston, though, so I would say that it hardly seems like you can go wrong either way...

Mezmo, what speakers are you running? And just to clarify, I wouldn't actually be bridging the 4B-ST's but rather running one channel for the LF post on the Nautilus and the other channel for the HF post on the Nautilus. I would then do the same thing with the other amp/speaker. I'm just trying to determine if it's better to run 250 watts to each LF and HF post or to just run 500watts and run jumpers or bi-wiring.
Although if I did go the 4B-ST route, I may buy a single one at first. That's a good idea.

I have been considering the same thing. I recently purchased the N802s and have a 250W amp which drives them pretty well, but after some discussions with my dealer I think it would be better to go with the 500W power rather than biamping dual 250W. I think the bass would benefit more from something more than 250W. Besides that, I am using the XLR connections, and my preamp doesn't have dual XLR outputs, so I'd have to get a custom Y adapter made which is also a concern - I'm not sure if that would degrade the quality of my cable connection or not - and it does change the input/output impedance between the preamp and power amp.

As Mezmo mentioned, its better to go with the 7BST or 14BST since they are designed for that power. I think in general bridging an amp raises its distortion numbers a bit so the monoblock design would be better. If you have the money, then I think your choice should be getting either the 7BST or 14BST. I think I would lean more toward the separate 7BST monoblocks, but there probably isn't much or any difference between the two 7's or one 14 - six of one or half dozen of the other...