My standard answer to the question of what super-power I would take is super speed. I guess it says a lot about my outlook on life - there's never enough time in the day to get everything done. If I had super-speed, I could read entire books in a flash, travel anywhere without wasting a lot of time in between and generally do more instead of feeling like time is rushing by. There's also the really cool effect of being able to get in and out of anywhere before people notice ... except for the sonic boom and other chaos.
I guess the down side would be that I'd find it hard to do my ordinary desk job because I'd be cramming six months of work into an hour before anyone could tell me what to do next. I suppose, however, that I could earn my day-to-day living in emergency response and pizza delivery while writing novels in the blink of an eye.
Mokalus of Borg
PS - I could also do stocktake for retail stores so quickly they wouldn't need to close down.
PPS - Though they'd need to double-check the results.