If you're playing well, and positioning yourself properly, self healing is unnecessary, the heal you get from firing off healing aura should be enough. If you're the type to ignore game mechanics, then you should probably pick it up.
I can't imagine the thinking behind not getting AP, that is such a butt saving power in endgame. So many AV hits will drain the tank to near zero, and you can get em right back to full in a second with it. Early game, AP is pretty dangerous, but a must in iTrials.