Of course no one here will admit to being a collector but the reality is almost every film camera user is a collector to some degree nowadays. It's hard not to buy a camera when you find it ridiculously cheap somewhere. I would vote for finding and using if at all possible the really strange cameras. As far as MF cameras to collect- I would look for a Koni-Omega because of it's unique handling attributes and strange look. Using it in practice is not something I can subject myself too, but it sure is cool in theory.