Who are the best quarterbacks ever, and how would you build the next one, SportsNation? Tom Brady is looking to cement his legacy as one of the best signal callers of all time with a fourth Super Bowl title, while Eli Manning hopes to begin an eventual climb up that ladder with a first Super Bowl title. But what about the big picture? Which quarterbacks defined the eras in which they did the bulk of their work? Where do the league's current quarterbacks fit in the scheme of things? And what are the keys to quarterback greatness?
Will Tom Brady supplant Joe Montana?