I think Atlanta's biggest problem as you can probably see is traffic. I'd figure out if you want to live inside of the 285 loop, or outside, then determine where traffic isn't so bad to narrow down specific parts to live in.
Living inside of 285 is cool, but unless you've got a lot of money, don't expect to find a place with a garage for a reasonable amount of money. I'm sure its do-able, but expect the area to not be so great. If you don't care about having a garage or nice parking, I'd personally get a loft downtown. There are some pretty swank warehouses converted to lofts. Depending on what and where you'll be working, your commute could be less living closer to down town and living inside of 285.
For me, I didn't want to deal without having a garage, or having to worry about accidentally leaving shit outside and having it stolen. Cost of living goes down quite a bit as you move outside of 285. I live in a pretty nice neighborhood in Marietta, and I could leave all of my bikes sitting in my driveway with the keys in them and I'm confident no one would touch them. The downside is commute downtown is a bit longer. But if you don't go much further north up 75 then Marietta, the commute is pretty good compared to other places. Of course my opinion is probably a bit biased