Congrats on such a successful application season!
NYU will give you a leg up over USC/UCLA in SoCal, but not to the extent that it's worth the extra $120k (assuming sticker at all 3 would be similar).
If you want entertainment law, you have to be in NY or LA. It doesn't exist anywhere else. (And as I'm sure you already know, is really just transactional law and soft IP but with particularly eccentric clients, but the clients are only in NY and LA).
Entertainment law, like anything else in entertainment, requires networking like crazy and paying your dues before getting to do the fun stuff (of course dues paying can be fun, too, just at a very low wage). You have to be in NY or LA for this. Since you want LA in the long run, I'd stay there and build a network. Networking in NY can help you in LA (coastal people love coastal people), but not significantly. Also, in NY, you're there with Columbia and Yale kids also networking, and NY lawyers, even in entertainment law, are big prestige whores. In LA, either of those schools would be solid.
As for choosing between USC and UCLA, they're pretty equal. Go with the one you like better based on class size, course offerings, professors, etc. Factor in cost, too, particularly if you get instate tuition at UCLA.
(Basis for my advice: studied and worked in entertainment in NY, worked for a V10 in NY as a support staffer, applied and interviewed for entertainment law summer jobs in LA, declined an entertainment law internship for a
higher paying regular SA in LA). Feel free to PM me with entertainment law questions.