Well if you picked invisibility your in luck. http://www.vnunet.com/vnunet/news/2166913/muggle-boffins-try-first . They've just tested the worlds first invisibility cloak ever! Just think of what you could do with one of those:338:
the cloak deflects microwave beams, rather than visible light, so it will not make objects invisible to the human eye.
With invisibility sure, you could sneak into girls changing rooms and whatever, and thats all fine and dandy. But rather than watch it, you'd get much more ass by offering to fly a girl around in your arms. Flying all the way.