Brown Rice Sushi
Second the rec for Shima.
M Cafe de Chaya has it too, though not a sushi bar obviously.
Never been to Yuta (How's the quality of the fish and what's the ambience like, Diana?)
FWIW, if you just want a quick fix, Whole Foods sushi bar will make brown rice sushi to order, as will Nikko Online Sushi Catering that you pick up at Wild Oats.
And, if you wanted to cater an event with brown rice sushi try Seedling Catering.