I'd take the power to abort fetuses with my mind. I'd emblazon a costume and cape with a coathanger logo and solve the world's overpopulation problem (and by extension the resource, pollution and starvation problems). I'd be fondly remembered as the greatest hero who ever lived.

Seriously though, I'd take invincibility so I could cause nuclear meltdownds and other large-scale disasters without being harmed myself.

Shape Shifting into any animal. object, etc.

I'd like to be stretchy like Mr. Fantastic!

invincibility. Oh yeah nothing can kill me baby!

read minds and invisibilty

Jedi mind trick... What liberalism.... waves hand. You do not need any liberalism.

That's hot.

I'd like to be able to shoot those energy beams like in Dragonball Z :)

The power to make people see illusions that I choose. That'd be fun. ^__^

edit: Also time control wouldn't be too bad either.

Teleportation.
That or Invisibility.