If you go with an older camera like a Rolleiflex, I'd strongly suggest buying one you know has had good, recent service. If you're going to be actively shooting it, they benefit so much from having an overhaul and it'll save headaches in the near future.
Personally, I used to scoff at the prices of a serviced camera, but I found out very quickly that buying a cheaper camera and having to get it worked on a year later ends up MUCH more expensive than just buying a serviced one outright.
Also, find out what "CLA" means to the seller. There are film transport overhauls, shutter overhauls, front plate control overhaul, etc etc.. all very different things. You don't want to assume (and pay accordingly) for a full camera overhaul if only the shutter was worked on. The big name Rollei repair people lay them out separately (Krikor, Harry Fleenor, etc) and I suspect it's a similar case for the Hasselblad people and others.