I think "Psychokinesis" (or Telekinesis) is the most adaptable ability, as Deks said, you could pretty much, in time, learn to do anything with it including, flight, healing, protection against bullets and even enhancing your strength, speed and reflexes to a peak human point
At the moment I'd just want one of the old powers, well, the ones that are actually useful.


You want to be able to project diseases on the rest of us? 
So if I had to ability to manipulate germs or the physiology of another human being, I could give them sinusitis when they pissed me off.