I'm late to this thread, but congrats on the purchase of the 80/500 system. That's what I have, with the VP150 and QS8s in 5:1, and they've been great for three years now (80/20 movies/music). My room is almost the same size as yours: 16 * 14 * 7.5 = 1680 cu ft, and I've not had any problems. I stuck the sub in the front left corner (didn't even do the sub crawl) and even at low power it gives good chest-rattling bass and LFE.

Let us know how things go when the speakers arrive! We love write-ups!

Bears, beets, Battlestar Galactica.