Amp Config for B&W 802D's

I see a lot of discussion of Brand A vs Brand B in driving B&W 802D speakers. I'm trying to gather a bit different info.

I'm ready to change amps and there seems to be some different possibilities available for amp configurations and how the speakers respond. I'm interested in the pros and cons of each.

1st - a large stereo amp (400w/ch) wired direct.
2nd - a pair of mono amps (400w each) wired direct.
3rd - a pair of momo amps (400w each) bi-wired.
4th - a multi channel amp (200w mid/hi, 400w bass) for each speaker, or something close to that.

Does any one of the configurations have a significant advantage? Also, do balanced interconnects between the preamp and amp have an advantage over a good set of RCA's.

If you have some thoughts and care to share your expertise I would appreciate the info.

Thanks,
Paul