You have a true powerhouse of a school…right there…at an instate cost.
I would keep that in mind when you think about which school to choose. Despite the OOS cap, you will be meeting people from all over the US and from other countries. Your interactions and relationships will not be limited to those from your HS.
I would also take a look at Alabama honors, the program noted above, costs etc and see if that appeals to you more than UNC. I assume you received some merit to this school? It looks like $28,000 a year.