If I understand correctly, Michigan will cost about $28,000 per year for tuition, fees, room & board, while NYU will cost about $73,000 per year (even though you suggested that NYU would run even more at approximately $80,000 per year). The difference in cost over 4 years is about $180,000–maybe more due to travel between your home in Michigan and NYC.
Your career goal is to work in finance on Wall Street.
You love New York City.
COA is not a concern for your family–even assuming a 4 year COA difference of $200,000.
My biggest concern, therefore, is that you are a “pre-admit” to UMichigan-Ross as opposed to being a “direct-admit”. The terms need to be clarified as it is not clear to me whether or not you have assured admission to Ross.