My niece lives in L.A. with her family (5 kids). They are very happy there (she’s originally from Brooklyn). But one word of caution–the cost of living in California is way higher than in New York (housing, kosher food, gasoline, etc.) I also believe that tuitions are higher.
Add to that the cost of flying back “home” every once in a while to visit family, attend simchas… The job offer needs to be a lot better than what you have now and secure. Hatzlacha Rabah!