I think about the RB67 every so often. Even with the drop in prices I couldn't convince myself it made more sense then the other choices. If the camera is just going to sit on the tripod for landscape use a LF camera with a choice of lenses still seems cheaper. Can be lighter to. When I want something easier to handle then the LF then I've got the Pentax 645. I some times think of the Bronica 6x6 with leaf shutters but can't convince myself of that one either.
The RB67 sounds like a do it all system but all that weight? Maybe I'll convince myself some time in the future :o