What will be the best selling 360 game?

[Funtime]

Halo Reach should do it easily. Halo 3 has sold 10 million+ copies and was released to a user base of 18 million. Halo reach will be released to a userbase of about 38 million. You do the math.

Expect just first day sales of Reach to eclipse 5million+ and lifetime to hit about 14 million.