A sports scribe on CBS Sports wrote an article that ranked all the D1 men's basketball teams from top to bottom in each state. Here is his California rankings. Other state rankings can be found by clicking the link below.
I'd put San Diego State ahead of USC and Cal below UC San Diego. Matt Bradley transferred from Berkeley to San Diego and that was huge for both teams gong in different directions. I'd also rank UCD higher. Maybe 12 but I'm just a wee bit biased.