After (only) two years of street shooting, here's what I've found:
About focusing:
In general I use prefocus and f/8. But I can't deny there are LOTS of light situations where I can't do it because I need a much wider aperture, so manual focus is what I do for nearly half my shooting. And if light is real low, my not too old eyes just can't focus fast enough... Then I use an AF camera. So, for this subject, I use (I mean I carry) a camera I can prefocus stopped down AND manual focus for wide apertures, and also my Hexar AF for low light as in churches. So no easy one-only answer here to me.
About lenses:
I have enough with any 28/35 set. 50 is being far to me and means losing too much angle in most situations. Then I carry more than one focal length: at least a moderate wideangle and a short tele. I can't be true if I say zooms are unusable: I carry everyday my compact 28-100 stylus epic, and it has given me some good images with great distance from subject freedom in the fastest way. Again, I can't go for just one of the poll's options.
About metering:
For sun there's nothing to think of. For soft light I find a meter in camera is faster than a handheld one, but I carry an incident one with spot just in case I can't reach the light from my place. Finally, I must admit AE is one of the most useful and effective options in street shooting, especially if film is not being wildly pushed. I've missed a lot more images because of slow settings decisions than because of AE unaccuracy, so my vote here would go to AE cameras.
About color:
No doubt to me: black is notably better for street in my experience.
So I see none of my cameras can do it all. Being honest and impartial, I feel my best tools for street shooting are the XA and R3A stopped down for soft light, and the Hexar AF for low light. Manual exposure cameras, and even worse, meterless ones, are inferior to me. I can use them well, though, and get great images, sure, but I also know they're just not as fast as other cameras for fast aiming in several directions with different light situations, and this is VERY common. I don't feel “knowing” the light from experience or from a previous handheld metering is enough: it's enough ONLY for certain situations that give us the great gift of time to think and decide, but if well used, an AE camera thinks well and A LOT faster.
That's why I carry two or three cameras at least. One prefocused and stopped down for direct sun without metering (Leica IIIF or R4M), one for most of the outdoors soft light scenes, prefocused or for manual focus if wider apertures are required (R3A and XA/Stylus Epic Wide100) and another one waiting inside the bag for real low light or just avoiding manual focus and manual settings anytime, but with total manual options too (Hexar AF).
Cheers,
Juan