hi there! we live in Carperntersville, IL and have driven down MANY times. saturdays are not so bad in Atlanta. I'll have to check with hubby nebo about the time we usually end up there.
we always had this argument cause I HATE driving through big cities and always made him take the Bypass. turns out, he was (right) I didn't say that!. all the trucks HAVE to take the bypass, so if you go through the city, you lose all those nasty trucks!. it's not so bad. just keep your eye on the signs for 75. (also, the bypass sometimes has backups near the airport.
we usually leave very early (like 3 AM,) to get past the city and on 65 in Indiana before rush hour starts.. we take 290 to 294 to 80/94, we go around chicago....
we HAVE taken 57 through IL and met up with 24 in KY. it avoids chgo, Indianapolis, and Louisville, but it adds some miles to the trip.
are you taking 2 days or driving through? when we had the boys with us, we stayed at a nice motel 6 in stockbridge, just south of atlanta. now that it's just the 2 or us we "press on" and stay in Macon (off the macon bypass), or perry.
stop at the GA welcome station and pick up those motel coupon books. you can call ahead when you get near the town you want to stay at (depending on the light situation, and hubby's sore back situation!

then we ask if they have a first floor, drive up (so we don't have to bring a lot into the room, just to sleep, and the car is RIGHT THERE, if we need anything.
PM us if you want any more info!
we like to buy sub sandwiches the day before and stop at a rest stop in tenn. just before the BIG hill before Chatanooga, and eat them there. (repack them in ziplock freezer bags in the cooler, or they get mushy).