I am an East Coaster (own property on OBX) and have lived in Central California and Southern California. If I had an option to live anywhere in California, and had the money to afford it then no way would I consider anything South of LA.
The conditions between Santa Barbara to San Simeon (C-Street, Jalama, Pismo, Pico Creek, Laguna Arroyo) are world class and it is an absolutely beautiful stretch of Coast.
Is it windy enough for a 10M-12M
I think most people in Central California ,do not know what a 12 is. In late Spring to August it is routinely 25-30+. It is really windy. The other thing I did not realize is that the wind is stronger out in California, because the air is cold and dry not hot and humid like Hatteras.
Then there is Santa Cruz and the Bay Area. The kitesurfing in Santa Cruz such as Wadell are about as good as it gets. And the surfing is also world class. Perfect side shore conditions and you can ride a 8 meter most of the time. It is much easier than Hatteras in that there is no fighting with beach break or rediculous current.
Or the Bay area which also blows like a mofo. You can split the difference too such as around San Jose, and have both worlds. So if it is firing on the Coast you can head out to Santa Cruz, if not stay on the Bay and ride places like Crissy Field, Coyote, 3rd Avenue, and many more. Hatteras is a windy place, but during their season it is windier and more consistent. I would say that Hatteras is more year round wind. You will miss 15 mile downwinders, and trunking it.
All of these locations have really nice cities and towns, but the one thing with CA is that these really nice locations usually have a pretty big price tag to live there.
I am not going to doubt that someone who works real hard, has a lot of big gear could get 150 days in Southern Ca, but I lived there back in my wind surfing days. I surfed all the time, and it was great, but never once went wind surfing or was motivated to do so. When I lived in Central CA, it was always nuking. If you have a choice between Central CA, and Souther CA then there is no choice.
The lifestyle is real different in all these places. If I was you I would land in LAX for a visit. Do not head South. Get on the 101 and head West. Check out Ventura, Santa Barbara, (Stop at Wadell), Santa Maria, San Luis Obisbo, then end at San Simeon. Then cruz through Big Sur, past Monterey up to Santa Cruz. At this point once you have seen this strip of coast, you probably will not want to live anywhere else. It is pretty amazing. But then cut across to San Jose, and check out all those cities and towns up and into San Fran.