Hi cam...
I'd agree with jonastovall: no AE needed for street...
If you don't use transparency film, the latitude of b/w or color film will be enough to get good results. Just use an incident meter and adjust when lighting changes
a lot. Even the exposure instructions supplied with every film should be more than O.K.
Or take a look at this thread:
http://www.rangefinderforum.com/forums/showthread.php?t=34642
Lots of great "pocket exposure charts" and info about exposure in general... It's very helpful when you don't have to worry too much about fiddling with exposure. You'll be busy enough reacting to picture opportunities without getting distracted with camera settings...
Hope this helps...
🙂
Michael
PS: As to your opening question: I prefer my chrome M3 for street; after a CLA in Solms it's the finest/smoothest/quietest Leica I've handled to date, although sometimes people start asking questions about this "funny little, OOOOLD camera" (Old? it's a day younger than I am! Am I OLD?!?!?!
😀. So for the more "stealthy" stuff, I use either the M6 or one of the M4-Ps (all black)...
PPS: Greets from Cologne to my beloved Paris!!!