Considering medium format...

Check out this link:

http://janneinosaka.blogspot.com/2009/04/pentax-67.html#comment-form

and:

http://www.pentaxforums.com/forums/post-your-photos/122456-streets-another-stree...

I'm not familiar with the Bronica S2, but the S2A is a superb
camera. I've had mine for 35 years and it's only needed one
repair and that was early on. Since then THOUSANDS of rolls
of 120 have passed through it

The Nikkor lenses are superb (i've got the 50mm, 75mm, 135mm)
usable wide open and as sharp as 35mm lenses.

Some nice ones on this site link

The problem with quite a few medium format cameras is that they can be damaged by incorrect operation and they may have been handled by a few inexperienced users. You can't do much wrong with the Pentax 645 systems, but you can with most other SLR designs and you certainly can with the Pentacon 6.

Many newer photographers may not even know how to wind on a TLR such as the Rolleiflex.

Hi, why not try an old folder, usualy smaller easy to carry around and very quiet I have a super balda baldax,funily enough I have one in perfect working order for sale! they have coupled range finder automatic wind on and a great lens 80mm f/3.5 shutter speed B to 300s. They are well built german camera and fun to use.
andy