Shady, I don't think the Denon 4810 is going to have ANY problem powering your M80's.
With the Emo's, it's not the wattage, it's the architecture. Do a forum search here - there are lots of threads. Generally, some people have had big-time issues with the XPA's, some people have had no issues with the XPA's and I don't remember anyone having trouble with the UPA's. I know that's counterintuitive.
I'd get the Denon and see how it goes. If you really feel like you're not getting what you need, look at used, high-quality amps from Krell, Rotel, Bryston, etc. in the 200wpc range.
