I bought my Hasselblad 501CM with a 80mm CB lens, privately. It will need to go for a CLA some day, but I figured that into the price of the Camera when I bought it.
Since I don't use my cameras professionally this service could be all I will ever need.
If Mr. Odess will ever forgive me for using his name in a bald faced lie, I will send it to him. He did a overhaul on my SWC and it has never been better.
I have seen cameras on his site for sale and if I were to look for a 500CM I think I might check him out first.
I'd go for a CF lens.