From what I know and what I think I know. I think I would also suggest QS8s!!
A direct radiating speaker is used by lots of folks in a mainly music situation, but for a mostly HT system, the highly rated QS series is hard to beat!!
However a stand would probably be needed for the best effects on the open side of your room.
I suspect others more knowledgable of the QS series will pop in with clarification!!
The M3 is an excellent speaker for any number of applications, but I'm not sure it's really as good a match with the M80s and VP150 due to differing driver configurations.(even though the VP100 is successfully matched with the M3s in Axiom M3 HT packages!) The M22 or even the M2 could probably match up better and give smoother pans.
Ain't nothin' ever easy??!
Rich.
