Sorry about that mix up, it was past my bedtime.
I was thinking that dual vertical VP150s would look awesome and perhaps tie the dialogue to the screen better. In terms of timbre matching (w/ my m60s) another pair of m60s wedged against the tv would be good - and the m60s were designed to be placed vertically - and their 8ohm impedence (4ohms when wired together right?) would present less problems for the receiver. The difference in price between the two is only $50.
However, I'm guessing nobody has tried using an m60 as a vertical center. Would be an expensive experiment.