Ditto on PF Chang. I'd even go as far as to say they're a bit overpriced, but very yummy.

Another chain on the high side with wonderful food quality is Sam Woo. Several locations in southern California including one at Metro Pointe (a small "Mall" adjacent to the world-famous South Coast Plaza. The Metro Pointe location is a hybrid, on one side it has the "take out" buffet-style ... on the other side a nice (expensive) sit down. Very tasty.