What would it be and why? My power would be shapeshifting so I could turn into Angelina Jolie, and...
To be able to transform into a microscopic airplane and travel anywhere extremely fast because I am very curious, and I could obtain a lot of money through that power.
So easy... super speed. Either the kind The Flash has (actually moving fast) or his nemesis Zoom got (slow down time to simulate going super fast). Going faster then the speed of light? Brazil to China back to Philly in 5 seconds? C'mooooooon!! ^_^
You could turn into Angelina Jolie and get banged by every other person in Hollywood; LOL. I'd much rather be the one who gets to bang all the chicks than be a chick which gets banged by everyone.