We usually stop at the holiday inn express in McDonough, GA. It is south of Atlanta. We usually stop there for a couple of reasons. 1) it's south of Atlanta and my husband refuses to stop before or in Atlanta. 2) their pool stays open till 11 and it gives us a little longer for the kids to blow off some energy from the long day of driving before bed. 3) Holiday Inn Express has a pretty decent breakfast in the morning that is included.
The first couple if years we didn't make reservations and just drive until we had enough and were ready to stop. We seemed to stop in McDonough so we figured it was a good stopping point and we now make reservations.
On the drive home we usually end up stopping outside of Chattanooga somewhere but haven't found a regular point. Your stopping points are very realistic. We usually don't really sightsee between destinations much. My husband doesn't want to stop on the way there and we want to spend as much time as we can in FL before coming home to the cold so we don't stop on the way home either. Have a nice trip.