The only thing I wouldn't want is omnipotence. Although it could be used to save everybody in the world, think about it. The world would be mine to play with forever and beyond, and being affected by my slightly descructive passions, I'm sure I really shouldn't be granted with such an ability.

Invincibility would work though. Something like what the Alex Chiu immortality rings promise, only that you're immune to bullets.

"Stephen Wolfram is the creator of Mathematica and is widely regarded as the most important innovator in scientific and technical computing today." - Stephen Wolfram