I agree with md55. I have the M50s, VP100, and QS4s, and don't have any problem with timbre matching. While I'm sure an M3 center would be lovely, and F107plus5 will be around to tell you so shortly, you have to pay attention to the fact that the M3s are not as well shielded as the VP100. Now I haven't tried the M3s next to a television myself, but I did try M22s, and my CRT did display those lovely color variations from the magnets. Just a word of caution.
Of course, if you have an LCD TV or some variety of projection TV, you're just fine.
