The best restaurants in Atlanta are managed by the Buckhead Life Restaurant Group (
www.buckheadrestaurants.com)
IMHO, the best restaurant in the city is called Bluepointe, and is on the corner of Peachtree and Lenox Road in Buckhead. The food is modern Asian fusion, with a crazy twist on a lot of items. I have never been disappointed in every aspect when dining there. Just be sure to call ASAP for a reservation, especially during the weekends.
I am a big steak eater, and the best steakhouse in the city is Bone's, on Piedmont Road in Buckhead as well. Reminds me a lot of Peter Luger's with a stuffy clientele and staff (both are mostly male), and the most excellent steaks and sides.