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The United States should employ air power (bombers and fighters) from outside the country. Ground forces should be limited to airmobile operations and elite, inserted units. The airmobile forces should also be based outside the country.
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I had a masterful battle-plan for the battle of Afganistan in one of the other threads. It was a bit similar. Start with special forces who attack bin Ladens camps, and maybe Taleban strongholds. After that, cross the border with 50.000+ men (more if necessary), coordinate your actions with the NA. Drive to Kabul, surround it and neutralise it. After that.... See my above plan.
Iran might get involved in some point. Let them. They are there to fight the Taleban, they are not your enemy.