I hate to say it, but Nebraska and LSU may be two of the worst places to go if you're trying to get to the NFL as a QB. Neither school has had great success with their quarterbacks recently. And with the exception of Mettenberger, LSU has really struggled to develop any semblance of a quarterback in recent years.
Nebraska, at least, has some potential given Langsdorf and Riley's backgrounds/reputations.
Some NFL analysts recently pointed out that despite its dominance in college football, Alabama doesn't exactly churn out NFL caliber quarterbacks, either.
Even the college QBs who put up huge passing stats in air raid offenses like La.Tech, Houston, Hawaii and Texas Tech rarely translate to the pro game.
Given the 32 starting QBs in the NFL, some of which aren't very good and not likely to survive the next season, you'd have to conclude NFL quality quarterbacks are a statistical rarity regardless of the school they went to.
Whatever offense you're running, you want a QB with football smarts and leadership. That doesn't always show up on the stat sheet, and sometimes it disappears when that high school superstar arrives on a college campus without his hometown safety net, and gets cracked in the mouth by a teammate who doesn't think he's all that.