I'm a fan of Stoic. Conceptually, it's very heroic to be able to survive that one giant explosion or a fall from space to the ground or whatever. Heck if I were playing a character with it, just having it would encourage me to take stupid risks (at least until I'd used it for the day). "Don't worry, I'll be the one to jump out of the plane without a parachute and catch them on the way down." Who doesn't want to be the guy who stares down the dragon, takes the swipe that sends them flying across the room...and gets up again. That's the stuff of coolness.