I felt exactly the same way while working in SF, and have noticed a huge difference in terms of culture and diversity here in NYC. That said, if your goal is to

I felt exactly the same way while working in SF, and have noticed a huge difference in terms of culture and diversity here in NYC. That said, if your goal is to build a startup or company, then ideally you should be in whatever location is best for doing that (within certain boundaries, of course). If you can afford to live in either city and both are valid options for what you do, definitely consider NYC. The startup scene here is blossoming and like rm999 said, the amount of culture and interesting people you run into on a daily basis is amazing.