Welcome, Matt. Are you in Oakville, Ontario, or another Oakville?

I have the M80s, v2, and I run them with the Onkyo HT-RC370, a receiver rated at 100 watts. My room is 14' by 16' with a 7.5' ceiling, so about a third the cubic footage of yours, but I feel I am only using a small fraction of what the receiver's power for my movies and music. I suspect that, as JohnK has said, a receiver in the 100-110 watt range would be more than sufficient for your needs.

Bears, beets, Battlestar Galactica.