Worf, welcome. My own preference is for a single small vertical speaker above or beneath the screen instead of a horizontally configured center. When I got my M22s for main channel use three years ago I also experimented a bit using them as center speakers in my 5.1 setup. Of the options that you mention, in my view the M22s would give the best match(other than using a third M60)with the M60s. Using the M22s horizontally on top of the TV would in effect give you a TMMMMT center similar to the TMMMT layout of the VP150, and you could certainly experiment with that setup to see how you like it. My thought is that the vertical arrangement at the sides of the TV would be better, however. One point on that arrangement is that the center image formed by the two M22s would shift slightly for someone not in the exact center, but it wouldn't move farther than the M22 on that side.
