I have ordered M60's and am not sure whether to match them up with QS-4's or 8's. I don't need extra volume, and, as I am planning to use a 6.1 system, can get 3 QS-4's for the price of two QS-8's. In terms of overall sound quality and matching with the M60's, am I better off buying 2 QS-8's now and adding another one later, or would it be smarter getting the QS-4's instead? Any advice would be appreciated.