That's a nice receiver! I'm not versed in the HK products so I may not be any help.
One thing you should research is if the AVR 330 can handle a 4 Ohm load if you want the M80's. Most HK's do, I just didn't see any specs on if it can handle it or not. With the AVR 330 you can always install an external amp as it does have pre-amp out connections. This receiver will drive the M60's beautifully.
Hopefully someone can shed some more light on the 4 ohm question. I don’t like discussing external amp solutions around here.
