I'm looking to buy a second body for my 501CM. I've got a couple of "events" to shoot with some friends for fun and would like to have one body with the 80/2.8 on as my primary camera and another with the 50/4, to save me changing lenses when shooting (and have a backup as well).
So I was thinking perhaps I can get a 500ELX (or even better a 553 although that's probably a bit tricky to find for under £400), put the 80mm and the PM90 prism and shoot away. For the wide shots I'll have the 50mm on the 501CM and use the WLF. It sounds like a plan but then I'm not too sure about whether the winder is of any use for such things. Is it very noisy, for example? I've seen that it works at a rather leisurely pace to return the mirror and wind-on but at least it means I don't have to wind manually, as in the 500CM.
On the other hand, am I just complicating things? A 500CM/501C/503CX is just as good and as cheap, doesn't complicate things with electronics/batteries and weighs less, as I will be carrying two of these things on me at a time (plus extra backs and film and the prism on the camera with the 80mm...).
Not too worried about vignetting mirrors and such, I have a 501CM which works fine with long lenses and that second body is intended for use with a 50mm or 80mm. Also, I'm not too bothered about body age, I can get it serviced, I just want to make sure it has one of the new screens.