Street shooting? Done it most of my life, and I'm old. Camera? Any camera will work. If you learn how to use it. I've used Spotmatic with 50 and 28mm lenses, Olympus XA, Bessa R with 35/2.5, Leica M3 with Summicron 50/2, Yashica GSN, Minolta Maxxum 7000 with 24/2.8, Yashica T4 Super, a Pentax istDS DSLR with 18-55 lens, and a Rolleiflex 2.8.
If you asked me which camera/lens combo I'd take if I could only choose one, I'd say it wouldn't matter. Although, if pressed further, I'd choose any camera with a wider lens, and for speed any AF camera/lens. But you can offset AF speed by just learning how to use hyperfocal or zonefocus.
Then, in a class by itself, is the TLR. Slows down things a bit, but you get some great images. I'm not sure why, but a TLR is far less threatening to people (the looking down into the camera aspect) and it looks old (it is), and it's fun to use, and fiddly, and somehow you project all of that, and people sense it.
Plus, you get a hell of a negative.
Ted