Denon AVR-4520, Onkyo TX-NR5010/Integra DTR-80.3, Pioneer SC-68... plus add you own additional choices here.
You might even consider a processor/preamp like the Onkyo PR-SC5509/Integra DTC-80.3 plus separate power amps. But the improvement might no be that audible.
You could add a separate 3-channel power amp like the Emotiva XPA-3 to the AVRs mentioned, offloading some of the front load to this amp and thereby increasing the load handling capabilities of the remaining power amp channels(surround) within the AVR.
You would gain a substantial and State of the Art room correction system by those combinations, all of them, which probably could make all the difference in SQ.
For your personal power amp needs look at the following table hereEdited by gurkey - 2/5/13 at 3:46am