Mandrake - I'd agree with others here. I run a 7.1 setup as well (with QS8s in the rear and on the sides). However, before I put in the two rear speakers, I would consider other upgrades. The upgrade to the M60s and EP350 would be
considerably more noticeable than the upgrade to two extra speakers in the back of the room. The upgrade from 5.1 to 7.1 is a very subtle difference, especially in a room of your size. (My own room is only a bit longer than yours, around 20', and in my room the difference is very very minor)
Plus, if you upgrade to M60s and the 350 now, it's very easy to add the other two QS(x) speakers in the future when budget allows. If you do it the other way, it's a lot more difficult to upgrade in the future. Have fun shopping, feel free to keep hitting us up with questions as you consider your options.
Jason
