Ahhh. Damn if I were you I would be a proud Boston fan. I live right in upstate NY and I still hate most New York Teams. When it comes to America I'm just generally not local like that. I still root for Canada in international competitions. Plus New York's got a rep worldwide.
When it comes to basketball my cousin got me into the rockets. It's a sport that's really generous and forgiving as a fan to like a star player ergo the team. Used to be Mcgrady till his labia finally tore.