All those cities are great.
Personally, i would go to LA. This region got Hollywood and alot of other cool places, nice weather and there are alot of hot women to meet here.
Hot women move to LA from smaller cities in hope to become movie starts, singers etc. They also spend alot of money on their looks, if you are into those women. It's alot of rich people here and if you play it right you may end up with some nice contacts, even thought that wasn't what you were looking for. But i think it's a great town.