Rodgers will be an interesting one. Neither of his last two MVPs felt "earned", IMO. At his peak, he was as wild as any quarterback I've ever seen, but he spent most of his career seemingly playing a notch below that. I wouldn't put him in the top 5.
PFM is an easy top 3 pick any way you want to look at it. What gets me is that, if not for his neck, he could have been even better. His game hit a new level around 2008, right as the NFL was opening up into the pinball scoring era, and his health basically failed him a couple years afterwards.
If Manning got a couple more seasons in the 2010s, when Brees, Brady, and Rodgers were all putting up video game numbers, I think he smokes all three. He did when healthy.