Oh, a new car is a great consolation prize! Both Atlanta and Athens really require cars to enjoy yourself and be mobile; I went to college in Atlanta and I wished I had a car all the time. Spending money during college is also a great way to have a good time. Atlanta and Athens are both pretty low-cost, but when I was a college student in Atlanta as an upperclassman me and my friends spent a lot of our time off-campus doing various things around the city. With more money, you also have more co-curricular opportunities, like studying abroad or doing a fancy summer program.
I’m curious why you prefer Tech? Genuinely. UGA seems like a better fit for what you want to study than Tech does, although you could get the fundamentals of all those fields through the minors at Tech. At Tech, though, you could use the ARCHE to take PPE courses at nearby universities like Emory (and since you’ll have a car, you can get there easily!)
I am glad that you are being smart about the debt. As others mentioned, maybe you will go to Penn for graduate school? Columbia was my dream college in high school, and I could not afford it. I ended up going there for graduate school. I got to go to Columbia and I incurred very little debt 
Yes. That is why I specifically said $75,000 base, as you quoted in your post. In fact, the UVa brochure you sent me says exactly that: both the median and the average annual base salary is $72,000. I deliberately and specifically left out additional compensation. A signing bonus is a one-time payment that is also taxed. And annual bonuses are not stable, guaranteed amounts; they are dependent on the performance of the company and of the individual banker. I get a bonus every year in my industry and it varies; you can’t rely on that money to consistently pay off debts, as I learned myself.
I had a longer post written out, but for the sake of shortening it let’s just say that even a new i-banker making $75,000 base, a $15,000 bonus that she puts all towards the loan after taxes, and an average annual bonus of $20,000 is still going to be taking home only around $3,000 a month after taxes and her loan repayment. That’s a paltry sum to live on in a city like New York or Boston - some years I had more than that as a graduate student in New York. If she puts her year-end bonus towards the loans every year, then maybe she pays it down a bit faster - maybe 5-7 years - but then you are disrupting investments, buying a house, saving for a wedding, saving in general, and retirement funding.
It’s not a good choice.