I would vote for The Chattanooga Convention Center. http://chattconvention.org/ From their site
From the Chattanooga Convention Center, you can walk to world famous attractions, more than 35 popular restaurants and 2,000 first-class hotel rooms. Within five to fifteen miles, there are an additional 7,000 hotel rooms and 150 restaurants.
And I know it has been over 14 years since we had one in Kentucky, and has South Carolina ever hosted one ? How about Virginia? I know Richmond had one but it was before Louisville.
If we went back to Alabama Mobile looks interesting http://www.mobileconventions.com/