I agree with Mark. Speakers will far outlast your electronics. My HT is only 3-4 years old and was built from scratch with all new equipment, but I was tempted by Jay's (JakeWash) Best Buy link. Not thinking of changing my speakers at all, except for adding an EP800 , but I would like some of the updated features in the new AVR's even though mine is going strong!
I understand about WAF and space for the VP180 or VP160, just wanted to point out the vertical center option to you as I don't think most people when purchasing are aware of or consider it seriously. I know I had never even heard of the concept when I 1st bought my Axioms. Center channels were horizontally arrayed and that's all there was to it, never considered there was an alternative.
BTW, the QS8's make for an incredible surround experience.