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Hmm..

Halo 3 is at 7M and doing around 40k per week.
Galaxy is at 6M and doing around 55k per week.

The Wii's userbase is growing faster, so I think Galaxy will defeat Halo 3 eventually. Should take a while, though.

As for Brawl, its launch was a lot bigger in both Japan and the US, so I expect it to blaze past both. Definitely the most likely 10M seller of the lot.