Currently I have a bottom line Denon powering a pair of CM8s (L/R), a Mirage OS3 CC (Center), and two Mirage MX surrounds. The receiver is a Denon 1611, with 75 wpc. The receiver sure struggles when I'm using the stereo at high levels...
I did a little background search and I came up with the Pioneer Elite VSX-53, Denon 3312 CI, Marantz SR6006, and the Yamaha RX A1010.
Please note that while performance is important, WAF is almost equal in importance. As of now I have no AV component room to store all of the wonderful amps, zone equalizers, and whatnot that I will eventually accumulate, so the receiver must sit on a shelf in my A/V room for now.
Room is above 3000 cubic square feet