It's not exactly street photo, but I've shot with a Mamiya C220 hand-held using NPS (ASA 160 nominally) at 80, and Provia at 100. Unsharpness at normal enlargements is due to my scanner, and not motion blur, as far as i can tell with a loupe.

For street in MF, given that the lens is slower wide open, I'd be personally tempted to use Delta3200 at 1600. This allows for a reasonable f-stop for depth of field, and a shutter speed still measured in fractions of a second.