ann harbor is a big city so u should expect lil more expenses, however to live a student life in a student way - $500 should be sufficient..........but that too depends upon ur status i mean whether u r married or not...........but fell fortunate that u have gotten into UM, the endowment of the university in in billions...........as a TA u will not have ample time to hang around so ur pay will be well ..........i suppose u r in masters good luck