I bet that it can power them with no problem. Several of us use the 3808 around here with no problem, and its amp has only 20 wpc more than your denon. I talked to the folks at denon and they said that the 3808 is only suggested for 6 or 8 ohm speakers... yet everyone on here that has a 3808 and m80's has absolutely no problems at all.

I say go for the m80's

-David