studio fix fluid is my favorite foundation.
i used studiotech back when my skin was oilier, and it worked allright. use a base with it (prep and prime skin), aplly with a brush for fuller coverage, or with a dampened latex sponge for lighter coverage, and top with a good blot powder. coverage is buildable, however, seeing as how you're in souther california, where i am as well, you're not going to want studiotech for summer. you'll feel like your face is melting off, no matter what you do. go for something lighter, such as select spf, or sff.