I can't help but weigh in on the broader cultural issues you've mentioned jefa.
I live here in OC but spent 20 years living in the Pacific Northwest, in Seattle and Portland. My friends up in the NW are mostly all gay or lesbian and are all lilly white over-educated profesionals in the "right line of work" socially and culturally. (Landscape architect with two Harvard degrees, director of Pierce County AIDS Foundation, Intel mathmetician, etc.) They all consider themselves cutting-edge PC and socially progressive with loving hearts and expansive minds. But the dirty little secret is that they are all horrible snobs who look down their noses at the middle and working classes who dare drive the wrong car, or buy toothpaste at the wrong store, or order the wrong entree at the wrong restaurant, or wear the wrong jacket in the rain, or live in the wrong house in the wrong neighborhood that looks too planned. I love them dearly as friends from childhood, but honestly they can be boring snobs trapped in a sterile white box they created for themselves.
As I just got back from an 8 day trip to Seattle and the Olympic Peninsula visiting with many of these old friends, I think I can plug in to your quest for a social niche here in OC. The short answer is, you are going to hate it in most OC communities.
Personally, I love it here and have found fabulously hilarious locals to populate my life with. I do chuckle at the botoxed housewives gliding around Fashion Island, or the poseurs darting around the Irvine Spectrum parking lot in the leased BMW 3 Series that they couldn't afford to buy a new set of tires for. But I have embraced the local cultures found here in the varying communities, and can appreciate why millions of people of all races and creeds have moved here to find a quiet street in a planned community free from crime and violence and social strife.
But if you are looking for a neighborhood full of the right people living in the right houses to gain an approving nod from the Prius drivers of Queen Anne Hill or the U District, then I really think you are going to struggle here in OC. You should hear the snobby comments my Seattle friends make when they visit me in OC on occasion. Except for the day I take them to Disneyland, where everything really is fake, they have all decreed Orange County to be "fake" and can't understand why I don't live someplace "real". It all just keeps me chuckling! ;-)