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Since we're only talking about the PS3, I'd have to say Gran Turismo.
The only games on the PS2 that sold more were the Grand Theft Auto series, and this time GTA is split between 2 platforms, with the lion's share most likely going to the 360 due to the much larger userbase.
If you look at the other platforms, I'd say SSBB will sell best on Wii and GTA4 will be the top seller on 360.
I believe that SSBB will be the year's best seller due to GTA4 having a split userbase, and will probably outsell the two versions put together. GTA: San Andreas sold 17 million (combined PS2 and Xbox) to SSBM's 6.5 million, on a user base many times larger than the Gamecube's. Super Smash Bros. Melee sold 1/3 the amount on a userbase that was roughly 6x larger.
If Brawl has anywhere near the attach rate that Melee had, or even if it manages only about 60% of it, then it will outsell GTA4 on both platforms combined.