The best, IMO, is a Voigtländer Bergheil. The ones with Heliar 150mm f:4.5 lens tend to sell for less than half what the lens alone would bring. It can be used like a (very small) view camera, or like a simple box camera: The choise is yours.

The Zeiss maximar is more common, and almost as good. Same with the Voigtländer Avus, Alpin and VAG.