Chris, welcome. Considering that the size of the 3002 has been acceptable, I'd suggest that you consider the M22s, which are slightly smaller than the 3002s, rather than the smaller M3s. A vertical M2 center(if you get a separate center speaker, rather than having the mains form a "phantom" center at first)would match well. The QS4s should be excellent. Probably a more powerful sub than the EP125 would be advisable for that room.
Of course, the size of your budget(which might be estimated from your preliminary picks)will be an important consideration.
