The VP150 and VP100 should match M60s equally in terms of sound. The main differences between 150 and 100 AFAIK are :
- 150 can play a bit louder, you need this if you're sitting far away from the speakers (the "big room" thing)
- 150 has slightly wider dispersion; if you are going to have people sitting way off axis the 150 will handle that better
- 150 is really wide
What kind of seating arrangement are you thinking about ?
BTW, Axiom has knowledgeable people on the phone all weekend, you might want to give them a buzz even after we all respond here.
If you are using a projector, another option would be an M22 vertically below the screen. Some people even use M60s and M80s for centers, don't forget...
