I haven't been to San Diego in years, but have been asked by a friend for recommendations:
"if you may have a few inexpensive places to eat that are extremely delicious...burritos, japanese, even good fresh sandwiches-or something that's decent with a location that is special to the area. Unfortunately we're holding back on the fine dining for now but we love good food. I don't eat beef or pork but I'm not a veg either. we're only there for a few days."
I used to always suggest Ichiban in Hillcrest but I've heard downhill reports.