Hi
I'm new to rangefinders too, although I've been a photographer (exposing, developing and printing b&w and color) for 25 years.
You've got nice answers here... (For example Ferider's M2 & Hexanon...)
I just wanted to add that there's no way you end up this road just with one body and one lens... It's not just that you'll be needing at least a wide and a normal (and a tele if you like portraits, and I guess all of us do, in one way or another, sooner or later) but it's that rangefinder cameras, because of their nature, can't give you all the best in just one body, no matter the brand or price.
Leicas, Bessas, Nikons and Ikons are all great cameras. Maybe some of them are designed to last more years, but the ones made to last more, need periodical adjustments, and that means more money too... Old ones usually need service when you get them...
I didn't have money to start, and I was just in your place three months ago. In three months I've bought three bodies (Bessas) and three lenses (two CV and one Leica).
So I recommend you to make your decission not thinking about one camera and one lens only, but one camera and one lens now, as part of a system that fits your style of shooting... This way you won't lose time or money.
From this point of view, think that a 50mm has a real narrow angle of view... For example, a 40mm can be used as a 35 and a 50, but of course you'll need a wide angle too.
I came to rangefinders when I found CV designed a 15mm lens M mount with filter thread, one of the greatest news in photo world in years... So I got it and got the best camera possible for it, the R4M Bessa.
As I knew I needed a normal, and I should use it on my R4M too, I got the 40mm 1.4, a lens that for its size, price, speed and sharpness, is just a miracle. That's the minimum for me: a body with a normal and a wide.
Then I fell in love with the Bessa T, a camera for external finders and able to focus any lens. I picked it because on it I could use both my 40 and my 15, and I prefer not to change lenses or using two kinds of film at the same time...
Then I decided to complete my first set, and got the Leica 90mm Summicron for portraits, the old black one with a convenient tripod socket: it's cheap because next versions were smaller. It has the best bokeh I have ever seen. I didn't find it too big, as I'm used to carry Hasselblad equipment even for street shooting. Got another Bessa T for it.
I carry my 3 cameras in a small leather bag, and never go out shooting with only one...
Maybe a good start is buying a camera you can use well with a normal and a wide.
CV equipment is really wonderful. Buy new from CameraQuest, Stephen is fast and very well priced. He's sent me cameras and lenses three times to Spain.
Cheers,
Juan