Welcome to the board! I don't have much of an opinion about the receivers you mention other than I'd love to get a full Rotel setup myself based on their great looks and the wonderfull reviews from those on these boards. I currently have the m60's in a room slightly larger than you mention driven by a hk/3480 (120wpc) and it sounds just great. You're in for a real treat!

M60's
VP150
QS8's
HSU STF-2
Onkyo TX-SR805
Audiobytes for the PC