nah, a vintage leica could never be a bad investment. i don't even know what they have, but there's something magical about their pictures.
check some galleries online, some astonishing street photography with them. advantage they have is being so wee, and immediate, that they capture moments other users miss
wow, even more off topic, apologies....
Thank you Dudley for including my photograph in your example of "Leica" photographs. I'm glad you liked it, especially as it's a self portrait taken in...1972
A couple of things though: The photograph was not taken with a Leica, but with a Petri FT 35mm SLR circa 1969. I still own this camera today and if anyone here thinks it a good alternative to a Leica, I'll gladly sell it!
Second, it would be way cool to credit the photographers whose work you've linked to. My photograph can be viewed in it's orginal context at:
http://brucealangreene.com/photoswebfolder/self1970.html
-bruce