I know that the Onkyo's are not Axiom's recommended receiver due to the 4 ohm load of the M80s but there are a few people running them. I would also recommend the Denon 3808, there are more of us running this one on here with the M80s. I guess it comes down to the features you want. I beleive the biggest reason to get the Onkyo is for the video processor, Reon vs Faroudja in the Denon, for upscaling. The Denon offers an ethernet port for updates and is network capable to stream directly from a home network or for listening to internet radio stations. Those I think are the 2 biggest differences.
