Serbia: People really love sports and their national team, has the second best basketball team in the world. Has basketball as its national sport.
Italy: also have fanatic basketball fans, and have the best arenas of the 3 countries. It is a "1st world" country
Turkey: I would say that the turks are the most crazy fans in the world. Sometimes they are too fanatic and don't behavior themselves. But it would be great to see a sold out arena with everybody singing and rockying without stop.