I tried to find a less expensive center channel speaker to match my CS3.6's, but ultimately the SCS3 sounded so much better than the competition, it was a clear choice (the MCS1 wouldn't fit, size-wise, for my application). I am currently using AR TSW-110's for surrounds, and while they aren't bad, I am hoping to eventually add two more SCS3's. I would at least make sure that your center channel is a Thiel.
Tom.
Tom.