Thanks for all of the great responses. I am most interested in the debate between the QS series vs the direct radiating as a rear center. When I called Axiom regarding my original M2i vs. M3i choice, they pointed me to the M2i without hesitating. I mentioned it specifically as a dedicated rear center, and they did not mention the QS series at all. Truthfully, I didn't even consider the QS line, thinking DR would be the only way to go. Might the QS series do a better job acting as a rear center?
I am choosing they 6.1 over the 7.1 for aesthetic reasons. Is the gain from 2 rears worth the added space consumed? Thanks again for your help.--Andy