I have a Zeiss Ikonta 521/16 6x6. Paid $100, used it for a year and then paid another $100 for a CLA. It may be more basic than you want, and more fiddly to use, but it is a lovely piece of precision engineering, and highly capable.
Another 6x6, the 534 is probably easier to use with a coupled range finder and built in meter. I currently lust over that and the 524/2, an uncoupled range finder with the HUGE 6x9 negatives.
All of them fold up and fit easily in a jacket pocket and are pretty quick to have out and ready. Easier to carry around than a 35mm slr.
I also have, and love, a C33. The lenses are absolutely top quality and produce a fine image that the older Zeiss can't match. But it really is a heavy, bulky bitch to carry around compared to the folders. It's a completely different kind of photography.