I'd definitely go with M60s over the M80s. Even M60s are probably too big for your room, but if you're moving out sometime soon, that's OK. QS8s are great for HT, but multichannel music sounds fine also. For such a small room you could consider QS4s, which would also work in a larger room.

You definitely need a sub, esp for HT. You might consider M22/VP100/QS4 + a good sub like Axiom's EP175 or Hsu STF-2. That's a smaller configuration but would still sound very good. They'd also sound good in a larger room.