I'd like to say a mix of the Omnis they now build, just so I could also add a company of Cavaliers and Infiltrator Mk IIs for Mech BA tactics.
Ignoring the all-Omni option, my choice would be two each of Falconers, Black Hawk-KUs, Dervish, Enforcer IIIs, Sentrys, and Valkyries, just so that there's a mix and that everything is moving at 5/8/5.