I have just bought the Denon 1804 and it is a really great sounding receiver through my qs4'a and vp100. I would suggest you get the vp150 considering the size of your room.
I can't comment on the M60's but I now wish I had spent the extra cash for the qs8's.
Just a side note on the 1804 if you are ever thinking about a full 7.1 system. The 1804 splits the 6th channel into 2 speakers and only the 1 amplification channel is used. The 2300 has full 7 channel amplification.

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