So I have recently acquired a pair of M3s along with a EP-350 sub as the heart of my sound system. I was wondering if anyone had a recommendation for a good two channel power amp to pair with the M3s. I will be using the pre-outs on my Denon AVR 2803 to push the amp, as well as powering the remaining speakers in the system. I have a rather large great room (4200 cu. ft.) due to cathedral ceilings, and the power section of the Denon seems strained when I really want to push things. My budget is <$1000, and I am considering the following:

Rotel RB-1080 (200x2)
Sunfire 300 (300x2)
Sunfire Symphonic Reference (250x2)
NAD C272 (150x2)
Emotiva RPA-1 (200x2)

I understand that most of these amps exceeds the 175w specs of the M3s, but I have no desire to push the speakers into oblivion. I merely want ample power to push the speakers CLEANLY when I desire some extra volume. Does anyone have any insight as to which of these amps would make a nice pairing with the sonic characteristics of the M3s?