I would gladly trade in my 5.1 for the Denon x5200W, already have the front and rear and bass but would certainly add a couple of ceiling speakers and a second bass, streaming from my NAS would be an added extra blessing.
My current Home Theater consists of a 1980's Pioneer system that rocks pretty good but has about a zero % sound quality, it is hooked up through the 50in TV and seems to be the place where all of my friends want to watch the big games, on the other hand I have a kickin PC with over 700 movies...