There would be a clear #1 if San Fransico had a big need at Linebacker or Cornerback!
That's really the issue. The folks with the #1 have critical needs that can't be addressed with a player that most people would consider Top 5.
There ARE elite players in this draft: Derrick Johnson, Antrel Rolle, Braylon Edwards, Mike Williams and Cedric Benson all spring to mind.
Alex Smith or Aaron Rodgers will probably end up being #1, but either would be tossups to even make a Top 10 list of draftees.