I'm a Duke alum in a related discipline and familiar with the program. I worked with GHI people on a couple interdisciplinary working groups. It's relatively young, which is probably why it doesn't get much buzz here. I can say that the resources at Duke are phenomenal and because all their graduate programs tend to be smaller than peer schools, grad students get a lot of attention even from top faculty. As with all grad programs, though, the best fit depends on your specific interests.