Aikman is way too high. Dude only threw for 165 TDs. He played on a dominant team with the NFLs leading rusher, dominant oline, and a dominant defense. Warren Moon was better than Aikman.
I'd probably slide in Big Ben or Jim Kelly. I think you have Young too high as well.
I love Drew, but I don't know that he's #1. My top 5 are Montana, Drew, Brady, Marino, Manning. I know Tom isn't on your list yet because he isn't retired, but it's around the corner.