I'm a big fan of the folding camera. I've used a lot of them -- with and without rangefinders.

I like the Zeiss Ikon folding cameras, because they tend to have fewer problems. They came with either Nettar, Novar or Tessar lenses with the Tessar also being the premium optic.

The ones with the Nettar can be bought fairly inexpensively, while those with the Tessar will cost more.

Best of luck in your venture.