There was a survey recently about what superpowers Americans would want. The top ones were mind reading and time travel.
Seriously, mind reading wouldn't be all that fun. People think about the most psychotic things and I'd rather not read them. As for time travel, you wouldn't be able to do anything with it. If you change something, you've just screwed a bunch of things up.
I would like shapeshifting. That seems like a practical power that wouldn't rock any boats.