Having finished both seasons in heroes in the space of four days or something, I suffered an overdose, and the ill-effects (which are wearing off, don't worry) are that I spent a couple days frantically thinking about super-powers.
So, what super power would you have? No time-stoppage, and no multiple powers. Just what the power is, explain how it works and why you would take it. Preferably a made-up power, not one taken from Heroes, but that's okay too. there are only so many powers.
I choose total discipline and control of my body. Why? Because it is awesome. Everything you would do is exact, and you would have such total control over your reflexes that you could dodge a bullet (ie, you'd be able to move faster than they could pull the trigger). You'd be able to do everything so exactly that you'd be unbeatable, and be really amazing a sports too.