Nathan, regarding the center channel - the best SQ option is to have 3 identical LCR speakers. In your case that would be 3 M60's. However most people cannot accommodate a large vertical center like that, so we have horizontal centers which most people can fit. While I have no doubts that the VP180 is an awesome center channel beast from all reports, the best matching option is still 3 identical speakers across the front.

If I could do 3 M80's across the front vs. L&R M80's with VP180 center, i would go 3 M80's. Again that's just not possible for most people thus the development of the VP180 and now the soon to be VP160.

IMO I would absolutely go with a vertical M22 or VP180 before going with the VP150. I have a VP150 unused right now after I discovered for my setup in my room an M2 outperformed my VP150.

Hope that helps.

Dan
On-Wall M5HP LCR, QS8 & EP500 in 7.1