As I am sure you are aware of, ASU just brought in a top International Law Scholar who is going to be setting up the International Law Institute (Laura Dickinson). While, the schools you mentioned would be great choices, ASU would provide you the opportunity to get involved with a center in its early stages and make sure the professors running the institute really take up your own interests.
Plus, in this economy, it's never a bad thing to go to school for free and have zero debt when you graduate.