Sourdough by the Warfield

[rockyraccoon07]

Hi. So this weekend I am driving down to San Francisco from Humboldt County to go to the Warfield for an evening, then I'm driving right back up. I need some help. You see I've never had San Francisco sourdough and I want some and I don't know anyhting about any bakeries in San Francisco. I would much appreciate some recommendations for good bakeries in the area. Preferably close to the Warfield (on Market and 6th Streets). I'll only be there for the late afternoon, so I need places with longish hours. Also any suggestions for good all night diners would be awsome. Any help anyone could offer would be just super.
Many thanks.