While I do love the R-D1 for everything that it is, it is to far past it's prime to use efficiently in this day and age. The X100s is the best option really if you don't mind a fixed 35, or just buy a used M8.
Who ever recommended a bronica needs to never recommend gear again, ever. There is a reason NO ONE shoots them seriously other then skaters who can't afford the hassy fisheye. Terrible bodies, terrible lenses, even for an first 6x6 camera they are junk. The kievs are interesting, though really rough functionally compared to a 500 series hass. Again, I wouldn't buy other then the metered prism which will mount on a real hasselblad and is a good chunk less expensive then the OEM one. You can get a 500c with 80mm 2.8 first gen for under $600 if you are patient and do some searching.
I really do think the RZ is the best choice for a sub $1000 MF camera. The lenses are cheap and way sharper then anything most of you have experienced, with a good scan zooming in even past 100% is mind blowing. The bellows makes every lens a macro lens, rotating back is super handy, and you can put a 6x6 or 645 back on. They are big (smaller then the RB), but with a decent backpack and tripod it's a very functional camera, and not that expensive for something many working pros actively shoot with.