To be honest, not sure a room that small would be worth going 7.1, unless your sitting in the middle of the room, 7.1 might be a waste. I assume your sitting near the back wall?
You lost me a little in the last few sentences. If 7.1 is worth while, the "side" surrounds and "rear" surrounds normally would be the same model. Some people go with bookshelfs for the rears if they listen to a lot of multi channel music, however, the Q's do a good job for that as well.
Again, not to bash your room size, but I think it might be a bit to small for 7.1...You would be better putting the money towards another sub.
