Have you thought about an Olympus SLR? The body of an OM-1 is similar in size to a Leica M rangefinder but much more reasonably priced and with a great range of wide-angle lenses. The 35mm f2.8 or 28mm f2.8 Zuikos are terrific performers and very compact too. You can easily carry an OM with either of these lenses in a coat pocket. The viewfinders are large and bright too. Just a thought for a rangefinder alternative.