So I'll go ahead and tell you what I tell everyone thinking of coming here:
Don't do it. That is unless you have a really good reason to be here. I'm only here because I'm from here, and my wife is from here, and I have little kids so being near family is very important to us. Otherwise the tax burden, high COL, and waaaay to many people just isn't worth it. I'll admit though, if you can look past those things, it is a pretty kick-ass place to live. Just don't be jealous of your friends in other states that make more, work less, and retire sooner.
UC and Kaiser base pay is pretty dismal. I have friends that work in both. In either place, you can still earn a good living if you are willing to pick up extra call. With the UC's, your ability to take extra call is gonna be heavily influenced by which subspecialty call teams you are a part of and the departmental politics at play. Kaiser has had a nasty habit of only bringing people on as per diem and stringing them along that way for months to years before actually hiring you. The Kaiser pension is not as sweet as it once was. With the UC's, the ideal situation is to work at one that also covers the VA so you can collect both UC and VA retirement packages. To me, if you are willing to bust your butt at Kaiser or a UC, then you may as well just go PP. The nice thing about SoCal is that the overwhelming majority of PP jobs are MD only and (for the most part) equitable with reasonable partner tracks or none at all.
PM me if you want to more about the SoCal PP scene. But seriously evaluate why you want to come here.