I would start with Costa Verde Village and Towers, International Gardens, Regents, Archstone, Trieste, and basically all those apartment complexes in that area. Honestly, there are way too many to remember so if you happen to make a trip down here just stick to the UTC area and you'll be set. Those all have amazing shuttle/bus services to campus and are pretty damn close to both a major mall (the UTC) and plenty of supermarkets (vons, ralphs, trader joes).
In my opinion, costa verde village is the best choice. Amazing gym, very close to three shuttle stops, walking distance from the mall, bristol farms, a starbucks, and a few fast food places.
The reason I know so much about SD is because my girlfriend went to UCSD and we would switch off every weekend to see each other. She lived in costa verde village and I thought it was a good gig.
PS What's up everybody, I will be joining you guys in a few months at UCSD. I decided to turn down UCLA since I have already been here for 4 years and feel like La Jolla beach scene is exactly what I am looking for. Look forward to meeting you all.