I'll give another vote for the RB-67. I used to have one and traded it for a Hasselblad 500cm. Not that the Hasselblad is a bad camera at all, it's just that I regret getting rid of the RB because lenses, backs, etc. are so much cheaper than Blad lenses and accessories. The revolving back is a great feature too. I handheld the camera quite often and never had camera shake problems at all. The bellows are really nice too because you can get pretty damn close without having to use a macro lens.
Ara