Sounds like you want to make a Commando to me. You can go pure healer, have a damage shield that makes your casts uninterruptable, a knockback, and heavy armor.
You can also hybridize your spec to actually dps from range with grav rounds, whereas you get what.. sucker punch for a Scoundrel? That places your medium armored bootyhole into melee range? No thanks, man.
Sure, you are more mobile as a Scoundrel, but in a game where CC, charges, and sprints are rampant when you have those...
Just make a Commando and don't look back, they're so awesome.