Have you considered a fixed lens Fuji rangefinder like the 670 or 690 (GW or GSW)? These are big cameras but very easy to shoot with at eye level, and because they are leaf shutters in lenses and not giant focal plane, it's easy to get steady, sharp images. I had a Pentax 67 and sold it after 3 months of use -- just too much mirror slap for me, but YMMV. Also, there are loads of Fujis on the market and you can buy a very nice one for $400-$500.