The original post was about more aggressive off-road trails, but since the subject sort of moved on, I thought I'd join in.
I'm from central florida, but I like to drive up to north Georgia to camp, backpack, and poke along the forest roads in my TJ. I lurk in this forum, so I recognize the fellas like "Hilldweller" who live in the area and I understand they know their own neighborhood. I can find my way around up there, but I would be foolish to claim much else. But I thought I'd add my opinion here since I don't live there. Jeep trail difficulty is relative to what you have close to home, and I realize the numbered forest roads up there can be accessed by trout fishermen in honda accords. So I'm not debating what others have said so far.
I ended up interested in jeeps because I was interested in backpacking and have visited the area several times over many years. My first section hike along the Appalachian Trail was back in the mid 1970's. The small mountains in the wildlife management areas centered around Suches, Ga. contain countless miles of wilderness forest roads. North of Dahlonega, Ga. and east of Amicalola Falls state park, are primitive campsites, rolling streams, and hiking trails. The Appalachian Trail crosses the area as it heads north towards North Carolina.
In my several visits over the years, the numbered forest roads have always been in good repair. I usually seem to be just one more "tourist" amoung many in the woods up there. There are a lot of visitors who enjoy the area like I do. You don't need a jeep to get in there, but when we purchased our first jeep, it was to compliment our interests in visiting this area. I think its a great place to ride slowly along with the top down.
Compared to flat Florida, the hill climbs and streams along the primary forest roads are reason enough to load up my jeep and drive the 8 or 9 hours to get there. And there are also lots of secondary trails that fork off the primary forest roads. Most don't seem to travel far but they usually climb to some knob and require 4wd. Generally I don't have to worry about jeep damage/breakage but they will cause your cooler to slosh ice water around. Some visits I find these trails gated and other times the gates are open.
As for the two trails shown in the map by Hilldweller, I like to access that area off of GA highway 52 at Nimblewell Church road above Dahlonega. This turnoff is before you arrive at Amicalola Falls state park, so you don't have to worry about paying a park entrance fee.
Another area that I like to visit is the Cohutta Wilderness area above Ellijay, GA. It's a little bit farther north for me, but there are lots of hiking trails and streams there too. It's a good stock jeep/top down ride in the forest.
Which leads me back to a point of view. I've enjoyed more dramatic jeep trail rides. I've visited Tellico and Moab, Utah. And I've had a lot of fun fixing up my TJ wrangler with popular modifications. But I really prefer the multi-use weekends of camping, backpacking, and passive jeep rides in the woods north of Atlanta. I was up there just last weekend for three days. Camped along FR58 in area called Three Forks.