So Cal has In-N-Out, Fat Burger, The Hat and Tommy's, nuff said.
We have Five Guys as well, but I haven't tried it yet. In and Out has always been it, but I'll give Five Guys a shot.
I still have a warm spot for Bob's Big Boy. Whenever I get there I order a Big Boy Combo with extra Blue Cheese Dressing for the Fries, yummy.