If I could only choose one super power it would most definitely be super speed. Super speed would be so cool I could do anything faster than anyone, I would never be late again.
Have you ever thought about how someone with powers might control them? Since we have what's familiar to us in terms of abilities, would an enhanced individual also feel it natural? Then how weird and or difficult would the adjustment period be for an individual who had no powers and then gained them? Also vise versa.