Many thanks to all who answered. I value you opinions. For my purposes it seems a Bessa body and perhaps a 21. Now I must search for this set up. Anybody have advice on where they might be for sale at a fair price other than the usual major internet outlets?
Try Fred Miranda and Rangefinder Forum. Perhaps GetDpi. For retailers, have you looked at Keh?
Also, sounds like you are having trouble getting the exact sense of the the Dof of a 15 and a 21. This site will help:
http://www.dofmaster.com/dofjs.html but make sure you select 35mm as the film size. Even wide open (4.5) the 15mm will be pretty much ( 4' and out) in focus all the time, if you set the focus at 7 feet. By 5.6 you'll be able to cover a close focus of under 3' and go out to infinity with an hyperfocal point at 5.5'. What I'm trying to say is, it's fool poof .
The 21 is also extremely generous with DOF, but wide open and up-close. I prefer using it with zone focus: at 5.6, a turn of the focus tab to the left cover the really up-cose and personal stuff with 3' feet or so of DOF, and a quick flick to the right gets me anything in the 4' to further-than-I-care-to-record-on-film range. If I really needed EVERYTHING in somewhat acceptable focus, f11 would do the trick, with the sharpest focus being at 6' and the Dof covering under 3' to infinity.