I would definitely get super speed like the Flash!
Think of all the applications it has, which the tv show does a great job of doing. More momentum means super strength, more time in a day to accomplish things, like chores, investigations, and reading (the Flash is super smart just for reading TONS of books). He also can get to places quicker than any emergency services, and travel anywhere in the world, and time travel (that's one a little iffy physics-wise). He also would be invisible to eyes and cameras if he's fast enough, only a blur. He can also run through objects and cause other things to vibrate through objects. With his fast metabolism to do super speed, he can also quickly heal himself.
He is a serious contender against Super man with his Justice League, and against the entire Avengers team.
The Flash's superpower is the ABSOLUTE BEST ONE there is!
I dare anyone to challenge me!!