A Republic Commando Squadron or two ARC Troopers?
The ARCs have the advantage of superior armor and firepower, and are much more independant.
The Commandos have the advantage of numbers and squad based tactics, however are considerably less efficent on their own. I believe the four of them would be able to take out a sole ARC, but I'm not sure about two.
Setting: Anywhere on Kamino. Can be the landing platforms, the hallways, clone training chambers, whereever.