the only paving that i am aware of is on 85 at hwy 316. shouldn't be to bad though. doing 675/285/85 takes you around the east side of Atlanta. Depending on the time of day,and what day of the week, traffic should be your only issue. on 129/441 probably not a bad ride, I have run 129 between Macon and I-20 in my big truck. Not bad running. Alot of mobile homes are made in Eatonton, so you always have wide loads on that road. Again if you are on the weekend, it shouldn't be much of a problem. But you will be going through some prime deer hunting country. Never know when one will run out in front of you.
If you decide to go through Athens (God's Country), and you are doing this ride in the fall, you better check the football schedule. Athens is home to the University of Georgia, (Go Dawgs!!), www.georgiadogs.com You do no want to be anywhere near Athens on game day unless you are going to the game. UGA holds 92,000+ so traffic is really a bitch. When i had tickets, we used to leave at daylight to get out there and beat the traffic.
where are you starting from, what day of the week, what time are you estimating hitting ATL? If traffic is flowing, you can run 80 in the slow lane and still get passed. If traffic sucks, you can push your bike on the shoulder and pass people.
I live right off 75 south of Atlanta, FJR's and chick fil a biscuits are a great way to start the day.