I am a Judo Instructor and I just moved to San Francisco. I am looking for a school to train at too, and possibly teach judo. I just signed up for Ralph's place on valencia street. It's expensive and its a fight gym more than a BJJ dojo, but it looks pretty good Kurt Osiander is the guy you want to speak with if you want to do BJJ.
If you want judo, I would suggest SF State U. They have the best judo team in the area except for San Jose State.