You might want to handle a Pentax 67. It's smaller than the RZ, but it's still a pretty bulky and heavy camera, and many of the lens are less than petite. But very rugged and the Takumar's are beautiful both optically and mechanically. It's a field camera for sure, not a studio darling, but I still think it works best on a tripod.
I've handled but not shot with a Mamiya 7. I know they are supposed to have some of the most refined optics for any MF system, partially due to being designed much later than others, partially because they do not need to contest with a design that incorporates a mirror.
I went with 6x6 (Hasselblad) for leaf shutters, smaller size and interchangable backs. It's somewhat costly (but really not much more these days) but I do think that the Hasselblad is the best 'do-all' MF SLR in that it can comfortably be used in the field or the studio. But I suspect you want 6x7
Personally, I would not want a Rangefinder as my sole system but I know others would disagree.
In my opinion:
Price/Flexibility: Pentax
Size/Optics: Mamiya 7
Although, I might argue you should just stick with the RZ and pick up a TLR for portability.
^ Referring to the Mamiya 7 as fragile comes from someone who's not owned one .
The problem with online research is that it is all opinions and nothing hands on. Personally I would buy the cheaper Pentax 67 and try it out. If it isn't for you, you can re sell it for about the same money you invested. Then do the same thing with the Mamiya 7. A lot of what makes you like one camera and not another isn't exactly logical... it is a matter of feel. I am a Pentax 67 user but have always been impressed with a good friend's Mamiya 7 work, so twice I have borrowed it to see if I can get used to the range finder and both times it took me about an hour to know it isn't for me. The Mamiya lenses seem to me contrastier and for that reason seemingly sharper but the Pentax lenses render things so nicely... and you get to look through them when you use the SLR.
How about the fuji GW670?
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