I think you will be surprised at just how loud the SC or any other avr with that quality can drive the M80s. Most of these avr's are capable of producing clean sound to around 100db, to get just 10 more db you need about 1000w, with a listening distance of 3m away(my house)

Check this calculator out.

http://www.crownaudio.com/elect-pwr-req.htm

It gives you a rough estimate as to power requirements.

Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70