If Leftwich is there, he is a must pick. I don't believe he will be, but one can dream. I would not be surprised if he was #1 overall by the time the draft comes.
In the event that he is gone, draft defense all the way. First round Newman or Suggs. 2nd round safety or DT. 3rd round, another linebacker-someone like Victor Hobson out of Michigan. Dude is a smashmouth hitter and has great football instincts.
Solve the reciever problem through FA.