Basically you have a VERY GOOD receiver and you should have no problem running a pair of M80s from it. I don't know if there is a speaker ohm selector switch on the back or not and if there is, you should set it to the lower setting for the M80s. But I would recommend that you do not use two sets of front speakers at the same time (A and B speakers) when you use speakers of such low impeadnce. You could risk driving the amp with a load that would approach 2 ohm or less and that would not be good! The receiver has (6 I think) separate amps for HT so there would be no effect on the center or surround channels. The low impedance problem would only occur on 2 sets of speakers driven by the same amps (front L and R channels).

If you have the $$$ - I say go for it!