Benin (Dahomey)/Benin (Nigeria) 30 (33 - 3) -- I'm surprised to see such a runaway lead here. They're welcome to first place, but they're not the only interesting civ on this list. 
Creek/Muskogee/Other SE NA 14
Gauls/Britons 17
Georgians 22
Haida/Tlingit/Other PNW NA 24 (23 + 1) -- One of the most unique cultures in the New World, and they would offer a playstyle we haven't seen associated with New World civs before.
Irish/Scottish 10
Kushans/Bactrians 8
Maori/Other Polynesians 13

Creek/Muskogee/Other SE NA 14
Gauls/Britons 17
Georgians 22
Haida/Tlingit/Other PNW NA 24 (23 + 1) -- One of the most unique cultures in the New World, and they would offer a playstyle we haven't seen associated with New World civs before.
Irish/Scottish 10
Kushans/Bactrians 8
Maori/Other Polynesians 13