Originality? Last I heard the best title for the Wii was Legend of Zelda, closely followed by a Super Mario game...
The main games I see taking advantage of the Wiimote are sports games, such as bowling or maybe golf. Personally if I wanted to go bowling I'd go to a bowling rink.
Admittedly, the titles are all sequels, but I would buy a PS3 just for Final Fantasy XIII, regardless of the price. (And will do, once it comes out here... fing European release dates)