I like what Nick, Bruno and Dan have said.

It's entirely appropriate to base part of your decision on aesthetics; a vertical center has a tendency to just "look funny" to some people. If that's you, just get the VP100, VP150 or VP180 and you'll be very happy. If you think you can wrap your brain around a vertical center, get another M60 or an M22. I don't think there is much debate left relative to the sonic merits of a vertically-oriented center channel.

bibere usque ad hilaritatem