I think I'd probably have the power of invisibility. You could easily win fights, just run behind them and hit the person. You could also spy on people as long as you were quiet.
The power to stop time would be class too. Imagine just freezing time and putting something on the person. Like a sauce pan on their head, and then you unfreeze time. They'd look so stupid.
I'd pick invisibility though.
So, what super power would you have?