First, thanks for all the thoughtful replies. Every comment has been helpful.
I appreciate the philosophical turns this thread took, never mind that my original concern was a bit more prosaic: i.e., would the "middle" VF of .72 serve my anticipated spread of focal lengths or would I really be hating things if I didn't also have another body with another VF for either end of the range. Obviously, I've seen what frame lines are included, but knowing what it's like to live within those lines will only come with experience.
It's also confusing to an RF novice when you see people saying things like--if you shoot with a 50 often, then you really want an M3; or the Bessa crowd saying you really want an R4 if you're usually shooting < 35.
Based on the replies, I'm increasingly confident that I can start off with a .72 (or equivalent) and then see if I really "need" another body. Personally, I expect to build a lens collection SLOWLY and I anticipate usually going out with just one or two lenses, no matter how many I end up with. e.g., 28 and 50; or 35 and 75. Or a single 35 or 50. That said, I would love to have different speeds / types of film loaded at any given time, so...
Once I get sorted, I expect my kit to be film with rangefinder and fast primes; and digital with an SLR and fast(ish) zooms. The former primarily available light and shorter focal lengths; the latter for those times that digital SLRs are the tool to use, e.g., multiple flash, longer focal lengths, action stuff, etc.
Meanwhile, I intend to keep an eye out on how digital Rangefinder scene shapes up. I'm not really tempted now, but I hope there are significant advances and increased choices somewhat soon and that any RF purchases now will be compatible with the future!