I'm summarizing what you've written in these posts, but feel free to add/correct anything Im mistaken on:
You love Michigan.
You didn't love the sense of community at Columbia.
You don't know if you want biglaw.
You don't know for sure if you want to be in NYC or elsewhere.
Michigan is 90,000 cheaper (67,000 plus 23,400 in COA difference) + interest.
Columbia has badass prestige.
I know I'm biased, but . . .
(Rankings, Profiles, Tuition, Student Life, . . . )