I appreciate the spirited discussion and am reading and studying it all.
I do treat my 7.2 channel system differently than my 2 channel system. My front speakers will always be driven by my 2 channel amp (with pre-signal from my AV system) but the other 5.2 channels I don't have nearly as much dedication to from an audio purist standpoint.
The original question came from my thought "I really am impressed by how this Denon sounds with the speakers I've added" and thinking maybe I can go up one more level cost effectively.
So my initial response is that I'd rather not spend $10k on separates to watch an occasional movie. that said, $10K or more isn't a problem if I am convinced I will enjoy it that much.
Jerry