OK... you'll have a bi-amped stereo setup along with a 5.1 multi-channel setup.

The sub has it's own amplifier built in. It connects to the 950's subwoofer output.

That leaves need for 9 additional amplifiers. Front R/L (2), center (1), rear R/L (2) and bi-amped stereo (4).

That would be taken care of nicely by 1-755 and 4-M200 monoblocks for a total of 9 amps @ 200 WPC for less than a buck a watt.