If you go with a C body, watch out for the very earliest bodies. I think 1957 and 1958? The guts of these bodies are different from later C's, and parts for these is an issue.
Besides the year code they have a hole in the front plate, top left as you look at the front of the camera, that allows for access to a screw for service. Reason may not be right, but there is a hole there.
You don't see many old C's around.