In personally think you should go with M6os for the mains and then move your M3's to the surrounds. If your eventual goal is to move the M3s to the back surround channels for 7.1 or to use them in another system entirely, then I would suggest getting the M60s now andlater get the QS8's. I think there will be a much better jump in quality by doing this than by just adding QS8s. But, if your budget does not allow, then it does not allow.