I have an SR5200 that drives my M22s with no problems whatsoever. Matter of fact, listening would become painful long before the Marantz or the M22s gave out. It drives a 5.1 system (M22s, QS4s, VP150) at very loud levels and never really gets warm. If you like the receiver (and I certainly enjoy mine) and it provides all of the features you need, I'd say you could certainly do far worse. Go for it!

M22ti mains, EP175 sub, VP150 center, QS4 surrounds