Just reporting back on the sojourn up to Atlanta and back. Took the advice of the post to my query and rode 19 all the way to within 15 miles of Atlanta. Very nice! Lots of old Florida and rural Georgia. The cotton is coming in right now so the fields were spectacular. Very little traffic, mostly 4 lane all the way - a few construction spots - but nothing of consequence.
It was "nippy" when I left Atlanta on Saturday - 34F when I headed out. Sunny both on the way up and on the way back. My gear held up well - hands got pretty cold during the first hour of each trip. The trip each way was about 9-10 hours - 460 miles. I'd do it again in a minute.