I've always liked Canoe; it has amazing views and an excellent atmosphere. Here is the website: http://www.canoeatl.com/

I have never had a bad meal there.

Bone's Steakhouse is also really good, but unless everyone is going to order steak, don't go there. The fish dishes on the menu are good, but not great.

If you don't mind a little kitsch, Dante's Down the Hatch (for fondue) is a lot of fun. It makes for a good "experience" meal, and you can play around with a lot of different meats and sauces that they bring, but it's not "amazing" food. I've had a good time every time I've been there, though. If you go there, make sure you start with cheese fondue, then go to the meat fondues.