Sushi Ran is my fave in the Bay. Yoshi is the man! Fish is super fresh and you have to get the shaking beef and the miso glazed cod. Or do the omakase. Ozumo's is also good. There's also a place called Tekka on Balboa St that only does 2 seatings each day, set menu, rules to eating but is worth it if you get one of the 10 seats. If you have more time, get up to Morimoto's in Napa.