Thanks for all the suggestions!

My ear level at seated position would be between 3' to 4'. When you guys say 2 feet above ear level does that mean the bottom of the surround? My ceiling once finished will be about 7 feet as I mentioned. Is there a minimum distance the QS8's should be from the ceiling? Would the top of the QS8 being 1 feet from the ceiling be enough?

The other thing is that I would love to have a 7.1 but with the way the room opening will be, I will be hard pressed to have the side surrounds directly to the sides. It's likely that they'll end up behind a little bit. If this is the case, would I be better off just going 5.1 and placing the surrounds behind the seating area? I just don't want to go 7.1 for the sake of it if my placement won't yield better sound.