I agree with Harald, your best choice for something that can stay outdoors year-round is a native species. I'd check Georgia's Fish&Game website to see if they list native species and/or any restrictions on keeping them.
Besides any native species, all the common tort species in the trade are tropical or sub tropical species. You would be able to house any of them outside during the summer, but you'd either have to bring them in during winter, or provide them with a heated outdoor shelter. I know several people here in Phoenix who have converted Rubbermaid ToughSheds into outdoor shelters for their adult Sulcattas by installing those oilfilled heaters and a "tortoise door".
Redfoots, which are pretty common, along with the closely related Yellowfoots, are rain forest species, so they'd do extremely well during a humid Georgia summer. They also don't get too large, adult males can get up to maybe 18" in shell length, and have wonderful personalities. That's what I would recommend you start off with. Yellowfoots have basically the same care requirements, but tend to be a little pricier.
I don't have much experience with Leopards, but I believe they come from a drier climate than Redfoots, and get a bit larger, so you might want to hold off until you've got more experience.
I would stay away from sulcattas as a starter tort. Their care isn't that difficult, but their size can make them a challenge. Although they start off tiny, they get big fast. Adult males can get up to 250 pounds, so they require a great deal of space.
Also, no matter what anyone says, there's no way to sex baby torts, so don't plan on getting a female just because they tend to be smaller.