kate_ellen: Are you still trying to decide between Columbia, Stanford, and Chicago? I'm an MA student in the Modern Art program at Columbia. I could probably give you some advice if you need it. I haven't heard much about the art history departments at Stanford or Chicago, but Columbia is really strong in Modern art, both in African and otherwise. Kellie Jones electrifies, especially when you get her talking about Adrian Piper and African American performance art.
As for New York, it's one of the best cities in the world, even if it's not as warm as northern California. It's definitely worth the higher cost of living.