It is my understanding that HK rates their receivers very concervatively, and are high current designed. Some manufacturers claim gobs of watts per channel, however, they are not full bandwidth rated (20hz - 20khz). I think the HK will do fine, and give you all the volume you can take. Besides the m60's are very easy, efficient, speakers anyway.

I'm sure some of the other HK owners will jump in here and provide feedback...

M80s VP180 4xM22ow 4xM3ic EP600 2xEP350
AnthemAVM60 Outlaw7700 EmoA500 Epson5040UB FluanceRT85