Motel Circle is going to be your best bet. It is a decent area and there are a couple malls and several eateries near by. I don't know what the price range is there. If you are looking form something closer to Balboa Park there is a Holiday Inn just off the 5 near the park, but I don't know how comfortable I would feel staying there. There is also a Holiday Inn down near the water, I believe its on Harbor Drive. My wife has stayed there and it was nice with a great view. Your other choice is the Marriott at the convention center. I hope this helps.