For street photography I would entirely ignore the possibility to check exposure in the viewfinder. Exposure is to be set beforehand. Maybe focusing is something that I would do in certain circumstances, rather than relying on zone focusing (which is never the same thing, as far as reaching proper focus is concerned).
If you use B&W you don't really need a light meter for street photography in daylight. If using one, I suggest an external light meter. You just check the two exposure values (in the sun and in the shade) and you keep mentally ready. You should set your camera for the most likely condition (let's say shade: EV12@100ISO, email@example.com e.g.) and keep mentally this value.
If the occasion arises in shade, you just raise the camera to your eyes, focus rapidly and take the picture.
If the occasion arises in the sun, you close the aperture ring let's say two stops, without looking at the camera while doing that. Then you raise the camera at your eyes, focus rapidly and take the picture.
B&W gives you ample room for exposure mistakes toward overexposure. So for street photography you could use a 400ISO exposing it at 200ISO and really do without a light meter.
Checking exposure in the viewfinder while "in action" will IMO spoil many "street photography" opportunities.
This is a very nice review of various compact RF cameras:
For street photography I would care about the easiness of use and the quality of the rangefinder.
I have a Canon Canonet 19 QLIII but I find focusing with it a bit clumsy. The focusing gear has a sort of "handle" instead of the usual knurled ring and I find it less comfortable to use, also the action is a bit "stiff" in my hands. A soft knurled ring is IMO the best option.
I also have a Voigtländer Vito CLR of the sixties. It belongs to a generation which is a bit bulkier than those like the Canonet, but it has very large and bright viewfinder which has "real" magnification (1:1) and can be used with both eyes open very naturally. The range-finder is quite nice as well. It probably is a better tool for street photography than my Canonet. The lens is a tad less sharp than the Canonet IMO.