Answer the question you selected for profile question 3 here (300 words):
Follow your passion and don't worry too much about what's marketable and what isn't. You will probably change what you study several times, so start with something you are excited about. Your enthusiasm will make it easier for you to leave a favorable impression on anyone you talk with. Second, apply to the best places for studying what you are interested in, even if you don't think you will be admitted. You don't know, and you'll never know if you don't apply.