Just wanted to offer a recommendation for Sushiya. It's in a strange location that might make you nervous to try its sushi - they are at the corner of Rancho Penasquitos Blvd. and the 56 (or Carmel Mtn. Rd. depending on you look at this strange intersection).
Anyway, my husband and I are sushi-obsessed and recently returned from Japan and we love this place! Great rolls, fresh sashimi, outstanding tempura, cool decor, good service, and the price!!! - for some reason most of their rolls are always 50% off! I don't know why that is, but I'm not asking any questions!
We will be forgoing our trendy sushi spot (Ono in Hillcrest) for this place now. If you're in the area and want great sushi, consider Sushiya!
9869 Carmel Mountain Road
Rancho Penasquitos, CA