UNC's rivalry with UVA is bigger than with NCSU. Some people argue that its even bigger than vs Duke (for football purposes). 4th most played game in all of college football. 0 chance that they don't end up on each other's list.
FSU has been crying to have GT on their yearly schedule for some time now. It makes sense too, as it's the closest team in the ACC to them and they almost never play them.
No reason for us to have Clemson there. Geography would be GT, historical matchups would be Pitt or BC. ACC would also likely try and put Duke/UNC against Miami like they did for Rivalry week.