Zernhelt

I'm not sure what the rules of this forum are, whether this kind of a post is okay, but whatever. I'm about to enter my senior year studying Mechanical Engineering (with an Aerospace concentration) at GWU. I'm interested in going on to get a masters and possibly a Ph.D. in Aerospace Engineering, concentrating on propulsion (I'm torn between hypersonics and rockets, with electric propulsion as a third choice, but not ruled out). I'm curious if anyone has any suggestions for schools to look into. Both first tier (like MIT) and second tier.