I'm looking to do 7.1 in my home theater, and I really want to do in-walls for the side and rear speakers. I was looking at using the M2 in-wall, but what center and fronts would you pair with these?

My limiting factor is that this is a front projection setup, and I don't have the space under the 4:3 screen for an in-wall center. I figure a free-standing center would get me functional now, plus I could raise it later if I went to a 16:9 screen. I was planning on doing floor standing front speakers so the center wouldn't be lonely...

Any recommendations would be appreciated!