Peyton Manning is the clear cut winner in this years top five, and has been top of the charts for some time now.
He has separated himself as the NFL's top signal caller through his second to none control of his offense and rock solid mechanics. Year after year his receiving cores have great seasons, they over perform because of Manning. Marvin Harrison and Reggie Wayne are great receivers, but could they put-up similar numbers with any other Quarterback? We will never know, but I have my doubts.
Manning has been associated with good decisions since the day he was drafted. That day the good decision was not his, but the General Manager's who did not take Ryan leaf, who believe it or not actually showed great potential. This decision changed the course of Colts history and single-handedly took them to two Super Bowls, winning one. In the latest Super Bowl Manning made a uncharacteristic bad decision, but this does not change his place in history, as the greatest Quarter Back of all time when all is done. Brett Favre has thrown many costly interceptions but he's still an NFL great. Manning is no less of a legend than ever before.