Hi Anu,
Lucky for you, I actually live in South Carolina
When it comes to MBA programs in the Carolinas, Duke and UNC Kenan-Flagler are the top ones, though these will likely be tough for you, especially Duke, given your stats. I think Clemson and NC State are good ones to have on your list. I would also add Univ. of South Carolina in Columbia, which is particularly known for international business. Also perhaps Wake Forest, though they now only offer part-time programs in both Winston-Salem and Charlotte.
Rankings are based on a number of factors including employment rates, average GMAT scores, student satisfaction, etc. I believe that UNC Charlotte and UNC Greensboro have pretty strong part-time MBA programs and may just invest more of their resources there. But rankings aren't everything so if there's something you're drawn to with those schools, like location or industry specialization, then they're definitely worth checking out. Or at least keep them your list for now in case you want to apply to a safety school. Often the best way to find out about the program is to visit the school, if you can, or at least try to speak with someone in admissions. Often times they'll be able to connect you with a current student or alum that you could speak more with.
Good luck with your research and keep us posted if we can help!
Kate