Agreed.... The quality of the Voigtlander bodies are good and their lenses are great! The selection of lenses is awsome.. think Zeiss, Voigtlander, Leica.
R4A is a good choice if you want to shoot wide angles
R2A is a good choice if you want to shoot longer
R3A is a good choice if you want a 1:1 viewfinder (shoot with both eyes open) which makes it a wonderful street shooter.
For extremely low light shooting, check out the 28mm f1.9 Ultron (albeit mine is a little soft wide open) and/or 35 f1.2 Nokton (wonderful lens in general).
For street, I'd choose the R3A+40 f1.4 Nokton+50 f2 Collapsable Heliar +90 Lanther.
For B&W, check out some the old 50s Leica screwmounts (you need to add adapters to M-mount). Nice "vintage" look with lower contrast.
If you want you want fixed lens at bargain basement prices, I choose this Canonet:
you'll need to find a battery (original mercury is banned in the US, see
www.photobattery.com) and more than likely replace the foam seals in the back film door. It is an easy DIY project (see
http://www.cameraseals.net). They go for about 50 bucks in various places including
ebay. If you find one that comes with an operational Canolite D flash, get it. The flash is difficult to find and is designed to meter specifically for the Canonet.