Pappy Red's is pretty good, but have you tried The Swallow at the Hollow in Roswell, GA? To me, it is far superior barbecue. Just my $.02 for North Georgia barbecue.
I have recently moved to the west side of the state and live just outside of Carrollton, GA. If you ever make it to Carrollton, try Blue Moon Bar-B-Q located at the downtown square. It is excellent.