I plan on ordering a pair of R90's and a R200 for display, but I also want to order a pair of in-ceiling to use as rears. I am trying to shoot for the same approximate price range as the R90's so they can easily be interchanged in our packages. That gives me the options of:

CWT 160R
CT 265
CP-CT150

I haven't use any Monitor Audio in-ceiling yet except for one pair of CP-CT150 as rears once, and they were nice.

Sound-wise, which would be the best choice to match the Radius fronts?

Have you discussed this with your MA rep? They would likely be a good first step. All of their in-ceilings are nice.

Planning on calling him on Monday. Just figured some of the Monitor dealers on here would have a good opinion.

I would always ask here or ip first too.....some reps are goodd, have the knowledge and are helpful, like the reps on this forum.... :)

Some reps not so much....
Always get a few opinions from hands on experience, that's what this forum is for...

CWT 140's are the same driver. You might want to step up to the 160's. The 265 money on a nicer sub or something else.