I'd like to recommend Stray Fish, a newish sushi restaurant in the outer Mission in SF. For those who aren't familiar with it, it's located where the late Rock Soup used to be, on Mission at 29th.
My girlfriend and I went there last night and had some very tasty sushi for good prices. For appetizers, we had goma ae (spinach with sesame sauce) and seaweed salad. Both were good, about the same as we've had at other places -- there doesn't seem to be a lot of variation in these dishes, at least not in my experience. For sushi, we had shiro maguro, sake, and unagi nigiri and hamachi negi maki. All of the fish was fresh and tasty.
The place wasn't very busy last night -- there was only one other table that was occupied, albeit with about eight people -- so I want to spread the good word and get this place some business.
Stray Fish, 3299 Mission St., 415-920-9430