I have used a D300, M6, Contax G1, and Panasonic G1 for street shooting, and each one on them fails me in a diffirent way in some situations. If I were really interested in learning the craft of street shooting, I would stick with the Leicas. IMHO, as I don't get a chance to do it as much as I would like, the Pany G1 is best for me, and the contax G1 the worst.
With the Pany, I set the kit lens to about 18mm ( 35mm on 35mm FF sensor ), flip the screen, shoot from the hip, 1/2 press, and listen for AF confrim, then fire. I'm waiting for the 20mm to become more availble in about 6 months, and will add that to the kit.
The M6 is more work, but at the same time, when I get it right, it's just such a pleasure. As I said, it's me, not the camera, if I were to use a RF for all my street work, and shoot a lot, I'd get proficient at RF focusing, I can do it, and most of the time, pretty fast, but not near as fast as the G1, and never from the hip! As I have read, and do believe, there is something special about a CRF for this applicaiton.
As for the hyper focal settings, it's just a matter of studying how to do it, and then applying the correct technique.
The D300 can be made to work for this, just like the Contax, however, it takes more bending of the way that I like to shoot to make them work in the street setting.
YMMV.
Dave