I would choose Cal MAINLY because you stated you want to end up in the Bay area. As everyone has said, Cal's reputation is great and you get opportunities to work in the CA's public health department.
However, I'm very concerned looking at your loans. $28k is not a small amount and, when put together with your undergrad loans, you'll be paying it off for a while. Remember that subsidized loans for grad students are no longer available. I'm not sure if you're originally from the bay area, but rent around Berkeley is sky high (greedy landlords and large demand for housing) for subpar places.
It certainly seems like an additional $28k is nothing, especially when you're at a new start in your life. I suggest you take a closer look at starting salaries for professions you want to pursue ($40-50k for most...but remember income tax takes out a huge chunk if you're single), where you want to be staying, how comfortably you want to be living and how long you want to be paying off your loans. Use an online calculator for student loans to figure this out.
Do you know if you can work as a research assistant or something and have tuition waived? I think UCLA does this but not sure about other UCs.
Good luck with your decision!