I've been to very few sushi places in the valley, and most of them have been the strip-mall variety, but I always keep coming back to Sushi Yuki. It is quaint, friendly and, in my limited sushi opinion, they have pretty good sushi.
I usually get the combination rolls dinner -- California rolls, cucumber rolls and tuna rolls. I know -- not really sushi, but it is as close to sushi as I'm going to get, and it is yummy. So there.
Anyway, it's fairly small and not super busy, but probably a place for a lot of repeat customers like myself. Check it out if you are ever on the west side.