I don't know anyone down that way any more, I used to be in the grading business and worked all over the place from Elberton to Marietta and as far south as the outlet mall down there
I used to do all kinds of stuff with a little Cat D3 dozer.
Never really got the hang of the foot controls for the bucket on a bobcat. But give me a skid steer with all hand controls and it's on like donkey kong
Most places are going to have a 4 hour minimum, and depending on things may have a delivery fee.
A hoe isn't the best for leveling ground. And you don't want just a ditch run thru your property. Probably better off with someone with a skid steer. I would say a small dozer, but 40 feet isn't...
Fox has a shop in Gainesville and in Doraville, they are going to be the most expensive. Could also try H D Supply, no that is not home depot supply but HD Supply they are in Norcross.