Oooooh a tailgating dinner would be so fun!!!
We got married 3 years ago and had it in the conference room of a local community building. It was small, casual, and exactly what we wanted. As far as the menu, we each picked an entree and had it served buffet style. It's for the bride and groom, so go with their favorite food.
My sister got married this past summer and had hers at a mid-level restaurant. They're known for vegetarian food, which she is, so it was a perfect choice.
If you want to keep costs down, think alcohol options. We just had bottles of wine on the tables that we bought for cheap at Sams and they let us bring in. My sister had an open bar at hers, and I can't imagine what the tab was at the end of the night.
Can you go down to Georgia once or twice before to check out some places or will you be doing it all online?