Thiel SCS2 or MCS1?

Thanks Vernneal. That's exactly the answer I was afraid I would get... as you know, the MCS1's don't come up too often used and finding one in black will be difficult... guess the hunt for the matching MCS1's starts now...

You should also consider the SCS4 against the MCS1. I think th the SCS4 tweeter is the same as the top of the line CS3.7. I have a pair of the SCS4's and they are very nice speakers.

Former Thiel owner here, and use to sell the product.
If you're gunna stay with the MCS1's, yes, ,get the matching for center, or stay with stereo 2.1 channel for now.
Also, do your system a major major favor however, and cross those MCS1's at 80hz to a sub. You'll get maximum dynamics, and clarity, and you won't blow the high frequency drivers!
If you set these up well, and feed em good power and electronics, they'll reward you with very clear, detailed, sound with pretty descent sound stage and dynamics. Good audiophile grade sound quality with a cohesive soundstge that will delight your senses. Nice enough gear...