So I'm thinking Power Armored troops with a Balanced approach.
For Headcrusha, I would be good with eliminating him. He's served his purpose, and if he dies there will be a period of chaos in which new leadership will take time to be established, though we should do a Scry and Fry aimed at the remaining Warbosses in order to ensure the chaos is maximized and there's no clear chain of command. Also, I'm leaning towards letting the Black Irons do it, because this is a foe that could actually kill some of our heroes before going down.
I'm also down for the Thermonuclear Battle Tiger if we want to use it.