Another vote for the VP180.
I have all three of Axiom's center channels along with a pair each of M60s and M80s and have tried different combinations and the VP180 paired with either the M80s or M60s in my estimation is a vast improvement over either the VP100 or the VP150.
Considering your 14x13' room size and my experience with my own speakers I'd go with Michael's suggestion of a pair of M60's, VP180, 4xQS8 and 2xEP500. If you *ever* think you may move to a larger room or feel the ugrade bug may bite sometime in the future I'd probably do the Epic 80-800 system also as Michael suggest.
With that room size I might even start with just a single pair of QS8s for a 5.2 system and see how it sounds before buying the second pair for a 7.2 system.
