I am putting together a home theater setup (7.1). I would like to use a pair of RC85i's (in-wall) for the fronts and two pairs of RC60i's (in-ceiling) for the surrounds. Will these sound alright together, since they are part of the same series, or do I need to match the sizes as well? My primary question, however, is about the center channel. The way the room was constructed, there is a rather wide column of studs inside the wall right where the center channel would go, so I need to use an on-wall center instead of in-wall. What center channel speaker should I use? Also, what sub would be recommended for this setup? Sorry for so many questions - I appreciate any guidance you can offer.