Good Afternoon, David,
The Fuji MF rangefinders might be a possibility if you can live with a fixed lens. My 6 x 7 has a terrific lens and takes both 120 and 220 film; there's also a 6 x 9 version. Also, don't dismiss the old Koni-Omega system which has quickly-interchangeable film magazines for both 120 and 220. The performance of the lenses is comparable to that of today's glass.