Thank you for all of your advice. I expected it would be diverse, and it is. Since my earlier post I have done some more research, and it has allowed me to rule out some of the lower spec folders because I want a shutter that has at least a nominal speed above 1/200 (and I do know that leaf shutters on those cameras often are slower than promised). And I did look at Mamiya Universal Press cameras because I remembered they shot 6X9. I will investigate Baby Graphics, as I am intrigued by the possibilities of trying different lenses and having some perspective controls. But size-wise, these are my finalists right now: Mess Ikonta C, early Fuji 6X9 rangefinder or a Medalist II if I can find one that is fully functional at a comparable price. You've convinced me to stop worrying about film flatness. I had figured that if any roll-film format would be problematic in that area, it would be 6X9.