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Lots of folks have had excellent experience using a vertical center channel; dispersion of horizontal speakers just isn't all that great. They are made that way because they "look right" in people's homes, not because it is the optimal design for a loudspeaker. In a perfect world, you'd just have 3 M60's across the front, but that is pretty hard to arrange. If you can swing (and tolerate) a vertically-oriented M22 for the center, that would be an excellent choice.
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I completely second what good sir Tom says on the center channel. This is so critical for a good movie watching experience. Definitely suggest going with a vertical center channel or go big on a horizontal one.
And the QS8's cannot be beat as surround speakers IMO.
Good luck!
