Greg, another welcome. Definitely the M60s first if the budget requires stretching things out(use the B&Ws for side surrounds if you're keeping them). The M60s can do a "phantom" center and an actual center speaker can be further delayed, so my suggestion for the second buy would be QSs for side surrounds(switching the B&Ws to back surround)which are excellent both for 5.1 movie material and two channel music ambience steered to them with DPLII. Third, I'd suggest the sub.

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Enjoy the music, not the equipment.