Hi MW,
Just this week I ate at Sushi Dokoro Kirala on a recommendation from Thomas, and their uni was superb and served perfectly to my taste (the uni was chilled just a touch, the sushi rice was ever so slightly warm, pressed compactly, but still loose, and the nori was stil aromatic and not soggy). Otherwise, the only other place I tend to eat uni in LA is Sushi Nozawa (Studio City). Fresh uni is so delicious. It's like ocean-flavored ice cream. Thinking about the uni from the other night is making the eyes roll back in my head, it was that good -- plus the uni was really heaped onto the rice (no skimping!).
*salivating*
Daos