I think the power of flight is the ultimate one, I think pretty much everyone would like that, I'd love jedi mind powers "you want to forget about my thousand pound debt mr. bank manager" but if I could only have a little super power, a minor one I'd love the ability to point at people and make their pants fall down! that would amuse me all day long someones annoying you, you point at them and you get to see them look all embarrased! OR MAYBE THATS JUST ME!
I guess this is not so super-powerlike, but I'd love to be able to turn back time. I would love to erase some of the things I've done in the past. There are some things you just can't fix unless you can turn back time. I think we should all be allowed three turns at the time clock in our lifetime. sorta like the lifelines on "Who wants to be a millionaire".
A super power? Well in that case I believe Super Speed would do well enough. Now a reason for choosing such a power. I have noticed that in society the focus often falls to the "good" guy in the story. I however would use my super human abilities for world domination. Holding to the hope of course that I was the only one with this super ability. It would naturally make world domination that much easier. Though possibly not as much fun.
Even though Super speed would be awsome fun. I've thoght about this one allot, It would be to mentally blast anyone and the would relive the worst tourcher and behavior that they have ever inflicted on another person ten fold, then after the incounter they would want to do good for the rest of their lives. This would also cause any one that was aggesive toward you to become pacified.
Psychokinesis, One of the most power psychic powers on could have, to affect reality and matter with you mind. Moving object, flight; break a person down from molecule level, stuff like that. In other words a lot like the Phoenix from X-man, or like Mai, Psychic Girl (a Japanese manga).
I would like invisibility and strength. Of course, if I could change the fact that I have a fear of heights, I'd say to fly...or to talk to the animals. That would be cool too!