Best value undergraduate schools to break into IB

I am a high school junior who is interested in finance, specifically investment banking and private equity. However, my family’s financial situation is to the point where all the top private universities are simply unaffordable as my family is upper-middle class (too rich to get any need-based money, but too poor to pay sticker price for four years). Contrary to my what my family wants, I want to leave the state of South Carolina to pursue my dreams of being more than my peers around me. In other words, I don’t want to go to a cheap non-target that will make networking virtually impossible. I have confidence in my soft skills and drive, but what are the best state schools or private schools with good merit-based opportunities that can help me get my foot in the door? I wouldn’t mind working in Charlotte, Atlanta, or Houston; I don’t have to work in New York to be happy. For the record, I want a career in finance for a couple of decades to have enough money to launch a political career in my 40s.

TL;DR- My financial situation is that top private schools are too expensive, what are my best options for a