los angeles.
first, every ethnic group on earth has an enclave in LA. second, it is the first destination of the food grown in the central valley, where it is always sunny and so the produce is better than practically anywhere else, and is close enough not to suffer during transit.
the trick of course, is finding it. don't expect decent food along the third street promenade, along la cienega, in old pasadena, or in westwood. more so than other parts of the world, a restaurant populated by white people aged 20-30 will be a "scene" and is almost guaranteed to have bad food.
and ironically, the best ethnic food isn't always in the ethnic enclaves. i think the best thai place is in sherman oaks, not thai town. the best indian food i know of is in cerritos, not artesia. there are lots of good korean places in fullerton. my favorite japanese places are south of brentwood. and don't get me started on how little chinese food there is in chinatown.