I don't like how UWZ broke up the purchasing of units (but that his a whole other rant). I also don't like how they made the Cartel troop w/out a HMG or LMG (unless I missed something blatantly obvious-always a possibility).
That said before when they could take whatever they wanted they were considered out of control. I would say they can pick from grunt units and the Doomtroopers count as their elites.