I think I'd take Rooney, Heskey, Defoe, Crouch and Bent. Bent worries me though as I'm not convinced he's international standard but he has got a lot of goals in an average team. (but he also can't take penalties!)
Maybe Zamora should go instead of Bent because he'd be our wild card and an unknown quantity for the opposition.
For some odd reason Crouch and Rooney get a lot of goals when they play together so I'd rather start with them two rather tahn Rooney with Heskey. Ultimately though our second, third, fourth and fifth strikers all only good enough for the bench which is a bit of problem.