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Pikmin if not.
Pikmin
Luigi's Mansion
Eternal Darkness: Sanity's Requiem
Those are the four games availble, yes?
Well, I'd say, get Wave Race if you're wanting a good multiplayer game, or ED or Pikmin if you're looking for some good single-player fun.
Alternatively, just get Pikmin, and then get Super Monkey Ball 2 and Metroid Prime (out on Friday) along with your Cube. :-D
Both look pretty cool, i personally chose purrrrrple but its really down to your personal taste!