Good choice with the QS4's.

I'm surprised no one else mentioned it yet, but when you look at getting a center channel you may want to pick up a single M3. This way you will have a perfect timber match across the front and others have mentioned that you should also have a wider dispersion.

High Gloss Cherry
M60 VP150 QS8
Open for Auditions but please don't drool on the High Gloss