You should look into the faculty at NIU. My main AOIs are Metaphysics, Epistemology, and Philosophy of Religion. When I told the director of GSU that I would be taking NIU's offer over GSU because it seemed to be a better fit for my interests, he agreed with me wholeheartedly and said something along the lines of "Although we are sorry you did not accept our offer, given your AOIs, NIU is definitely a better fit for you. We wish you luck."