For me it's:
La Paz in Calabasas. Yeah, so it's not "authentic" Yucatan-style (according to somebody else), so what. The food is still tremendous, and the portions are big enough to feed a small army. I just wish it was closer. The key here is to order a la carte.
Domenico's in Pasadena. Old-school italian. The thing here is consistency. The food is always hot(amazing isn't it how many places serve cold "hot food" and act like it's no big deal) and delicious. If they make something that's not to your liking, they will go out of their way to make it right and act like it's no big deal.
I'm sure many of you have places like this...