I would've used Vanille, but I was busy trying to get her maxed out as a Saboteur, Death was a nice incentive to throw all of her CP at that lol. AS a resulat, she was relatively average as a medic at the time, but now, yes, she's definately my best healer. Snow I won't add in until I get him maxed out as a synergist. I can't swap out Sazh until I have someone who can buff as well. Until then, I just use Fang for both Sentinel and Comando awesomeness.