My opinions in matching front channels are really to make the PERFECT home theater. I don't even completely have this in my system.
I was previously running B&W HTM2 D2 (with 6" midrange) for center and 805D2 bookshelves (WITHOUT midrange) for left/right. Since I did not have the dedicated midrange in my left/right, I could definitely hear that the midrange tones in the left/right were not as strong as tones coming out of my center. This was most prevalent when music from the left/right speakers was accompanying voices from the center channel. I have recently upgraded to the newer HTM2D3 center channel and it has an even stronger/clearer midrange. Still, the overall sound is really not bad at all and I am generally happy.
I recommended the Silver 300 as a minimum because of the dedicated midrange and the fact that music is your priority. I really don't think it will be that bad matching to the Bronze center. The Bronze center will not have as strong/solid midrange voices obviously, but I don't think it will be bad to listen to at all. You might sometimes feel that when people talk they sound feint or far away -- this could give you the upgrade bug to get a Silver C350 center (with its dedicated midrange), but you should be fine for now since music is truly your priority.