Gran Turismo 5, God of War 3 or Uncharted 2. Depending on when it will be released.

Should be 3 bundles.

GT5+ slim = sells millions and millions

Uncharted 2+ slim = builds brand power

Little Big Planet: GotY Edition+ Slim = PS3s most "casual" game, getting brand power.

GT5 or KZ2

All 3, though in different bundles:

1.) Slim and GT5
2.) Slim and Uncharted 1 and Uncharted 2
3.) Slim and GoW III

None. For a nicer profit margin. The price point can be the sales driver.

Slim Ps3 needs Bundles to sell hardware?

Well they can capitalize on initial sales and then once they begin to deplete bundle the game(s). This way they make money on the initial couple-many millions of units and then provide more incentive to buy the console later to non-owners.

GT5 or keep the MG4 and Killzone games.

Probably. Happy?

None... It doesn't need a game to sell, as long as the price tag is 299$.