I haven't had a lot of time to experiment with different cameras and compare results, so I'm wondering if anyone out there has opinions on good, cheap cameras that arn't super mainstream because there's no way to convert them to digital. I ask because I'd like to take on some risky assignments that might end up with my camera broken or stolen and I don't want to use my Nikon or Contax cameras.

I was looking at something like a Mamiya NC1000 or an old Pentax Spotmatic with the bayonet thread. They could also be Rangefinders. I would even entertain some Medium Format selections as well if you know of any.

...thanks in advance