I'm having a similar dilemma having broken one of my black mirror caps. I really like the cf look but my OH said they just look faded. I also don't like ill fitting parts and buying non-oem is a bit of a lottery. So I'll probably go gloss black again.
I think gloss black would also look best on the Indium Grey, as above cf may look a bit grey and look like a mismatch. As for the satin silver, I'm not keen on those even on an R. Or get a set sprayed in pearl black, that'd look good