Since you are looking for suggestions I think you can't go wrong with a Denon 2805/985. It has more than enough power for M60s and has more inputs than you'll ever need.

The first weekend I bought it, we watched movies at -15db. Friends came over and we were mixing -10db to -5db for several hours and the receiver was barely warm! Now those are some efficient speakers. Awesome combo IMO

Of course you can't go wrong with an HK, Yamaha, Pioneer either. Focus on features and price.