Which of these will be the top seller of 2008 worldwide?

[PS360ForTheWin]

1. Wii Fit - 9.32m (Wii)
2. Grand Theft Auto 4 - 8.65m (360)
3. Super Smash Bros Brawl - 8.26m (Wii)
4. Grand Theft Auto 4 - 6.65m (PS3)
5. Mario Kart - 6.52m (Wii)
6. Metal Gear Solid 4 - 4.46m (PS3)