There are plenty of other healers so if you get a head start on one, keep investing! She's good to have with a "last gasp" team.
She's more versatile than Talia, heals better, and gives you a chance to resurrect a defeated toon.
He's a proven lifesaver, and also easy to acquire since he's in hard battles and cantina battles. Star him and level him up so that you have his ability to auto-taunt when an ally falls under 50% health.
I also love sending out professional Jedi hunters like Cad Bane or Boba Fett. Dooku's new shock chance makes him a good choice here too. He cancels out their evasion abilities and his basic attack shock hurts everyone. But you can't go wrong with Empire teams led by Palpatine.