hoot
green behind the ears
thodo said:When I will have a wideangle-lens, this would be the 24 or 21, so I will need an external viewfinder anyway.
An M body with an accessory viewfinder is a huge beast.
Since you're new to rangefinders, and don't shoot on commission, I would stick with one focal length, and learn how to use it perfectly before considering adding another to your repertoire.
If you can, borrow a 35 and a 50, and see which one better corresponds to how you see the world. If the 35 is a tad too wide and the 50 a tad too long, consider a 40mm.
The appropriate body for the 40mm would be a Bessa R3a (if you need a meter and auto-exposure), a Leica M2 (if you need a camera that will outlive you) or a Leica CL (if you need a camera that you can stick in your pocket). In the case of the M2, the 35mm lines can safely be used to approximate the 40mm field of view.
As FrankS said, the M3 is probably the best body for 50mm. You can teach yourself the Sunny-16 rule and carry a small pocketable meter (such as the Gossen Digisix) for difficult situations. And you can shoot with both eyes open, if you're right-eyed.
The MP and M7 are so expensive, I'd be afraid to use them in case they got stolen. I'd rather spend the money on film, developer and paper.