It's been awhile since this thread was started, but if you're still looking..
I own a Leica M6, Canonet QL17 GIII, and also a Yashica Electro 35 GSN. I think if you've never used a rangefinder camera before, you should go super cheap and try to find a Canonet QL17 just to see if you even like rangefinder photography. Some people can't get used to it. That was my gateway drug that led to the Yashica, which led to the Leica.
I think I paid around $40 for my first Canonet. I prefer it over the Yashica because you've got more control over your exposure. You've got a shutter speed ring
AND an aperture ring. The Yashica only lets you adjust aperture and handles the exposure on its own, so it's harder to compensate for lighting situations if you need to. The meter isn't TTL in the Canonet, but it's right next to the lens, inside the filter screw, so it kinda works the same. The Yashica in comparison has the meter (which is pretty damn accurate I must say) next to the rangefinder window, so if you're using filters, you've got to adjust the asa dial to compensate and then remember to set it back when you take the filter off. The Canonet also has an exposure lock for when you're readjusting your composure (half press shutter button), while the Electro just changes the exposure to whatever you're pointing at at all times. I do think the Electro has a better lens, but i'd still go for the Canonet over the two.
That said, you mentioned you could swing a Voigtlander body and lens. M2/M3 (and sometimes M4-2) prices can be around the same as a new Voigtlander body.. so genuine Leicas aren't as out of reach as people make you think they are as long as you don't mind used.. just throwing that out there. You don't have to use Leica lenses.. they're the most expensive part of the package. I'm still saving for a Summilux 50

The Voigtlander, with its M-mount is going to be the closest thing to a modern Leica body with price as a consideration.