Marvin Harrison Jr. No matter what!
He has the size 6'4", speed and tools to be a SUPERSTAR player! He has done it for a few years and played his best in the playoffs last year against Georgia (who had a defense filled with NFL players. IF he doesn't get hurt in that game, Ohio St. probably wins.
Plus the whole pedigree thing, he has an unlimited access to his father and his (and Peyton's) knowledge of the game. He is by far the safest pick in the draft and has the skills to be the best player in this draft. I'm sure someone will go up to #1 to grab Williams, I would hold at #2 and grab Harrison Jr. You hardly ever get a chance to draft a generational talent, don't out think yourself, just make the pick and never look back.
He has Randy Moss talent, size and speed, minus the crazy!