I still remember, way way waaaay back, before the VP180 when the VP150 was the "flagship" center, and people commented on getting the VP150 or M22 center. Although we all make certain compromises. Like I bought a VP180 for a new center when I could have gone M60 for a center to match, but "just in case" my plans changed, or if I ever (don't want to think about it) moved again, I would have more options with a horizontal center vs. another vertical, but then again, the M60 is smaller than the VP180.
Lots of sound advice. I was very happy with my setup, but went with the VP180 as part of my whole home theater sound upgrade since I am having a much larger room than before (more than double the cu.ft.) and I saw more bang for my buck with a bigger center than going from M60s to M80s.
Good luck. It is always a hard decision, but you are getting a great product any way you go from a great company.
M60s,VP180,VP150,QS8s,20-39PCi,DMP-BDT210,HD-A2,JVC RS45, Onkyo TX-NR709, Shakers