Look for light leaks and the general condition of the bellows. I sold my 1964 CG with Ektar lens a couple of years ago when I had to fund a scanner. Not so sure that was such a good idea. It ended up going to somebody in Italy.
$325 is a bit high, unless it's a later model (top RF) and it has been recently CLA'd. But the reality is, the price is only slightly high since you mentioned 15 holders.
I kept all my holders and I'm probably going to pick up a Zero-Image 4x5 system.