Hm, power to teleport.

You'd be able to live independantly. On your own, make your own decisions. If you get in a sticky situation, teleport out of it. Teleport to resources, like water. You could take things without asking, and teleport away.

But that'd be using a pyschic power for bad, not good

Maybe telekinesis - bending objects like silverware with the mind. I've no idea how they do it, it's amazing. It'd really freak people out if you could master it and exhibit it at will.

What would you choose?

One psychic ability eh... Well, given the difference between psionic and psychic, I'd probably say...  Influence over the minds of others. Not direct control, but subtle influence... direct knowledge transfer maybe, transfer of knowledge directly from one person to another...