QB Zac Robinson, Oklahoma State
QB Dan LeFevour, Central Michigan
QB Jevan Snead, Ole Miss
QB Tim Tebow, Florida
QB Colt McCoy, Texas
All of those are likely starters in the NFL, and none of them will be taken in the First Round.
You can also toss in as possible starters:
QB Colin Kaepernick, Nevada
QB Case Keenum, Houston
QB Jarrett Brown, West Virginia
All of them have at worst Jake Delhomme/Seneca Wallace ceilings, and Holmgren is an expert at grooming Quarterbacks. I'm sure if he picks one of these in the 3rd, 4th, or 5th Round, the chances that he'll outproduce Derek Anderson, Brady Quinn, Seneca Wallace, and Jake Delhomme are pretty good.
When it comes to drafting a quarterback who's going to lead a team to a Superbowl, where he gets drafted is anybody's guess. There's so much one doesn't know about the person until they get them in camp, and even then, a whole organization can screw that up, too (see Brett Favre).