If I was going to buy one new game for my Wii, which should I choose?

[olnacl]

I know, tough question to answer, but I need to get a second remote and figure I should try something besides the sports games that came with it. The last thing I played on a game machine was tetris on a game boy (yeah, I'm kinda out of it) (well maybe WAY out of it) I value your opinions though.