I'm thinking that sometime in the next year or two I'd get a 755 (or whatever the current model at the time is called) and use it to bi-amp the mains so that 400 goes to each, 200 to the center, and 200 to each surround. The surrounds would be driven by the M-Blocks at that point.

FYI: Power handling on my center is 200w, and the surrounds are 150w.

Any thoughts?