The ocoee is a lot of fun. Even with the crowds, its worth it. There may be better times of day to put in to avoid the mass launch, I'm not sure when that is though. Also there is an upper section that doesn't run as much that is a a bit harder than the lower section. Tons of info on these runs on AW.
Tellico and the Little are classics in the smokies. Depending on what difficulty you are looking for, these could be great. The main tellico run has lots of ledges and one of the easiest 15ft waterfalls there is. I'd run it in a ducky! If you want more class III, I think there are runs adjacent or close that are a bit mellower.