You're crazy if you put Park ahead of Bourque... I love Brad Park, but Ray Bourque is an all time top 5 defenseman. Park is not.You are right on the money with Bobby Orr and Eddie Shore, but I would consider Ray Bourque to be the 5th or 6th best D of all time. I would put Brad Park ahead of Ray Bourque and I would also put Nick Lidstrom ahead of Ray Bourque and then you also have Doug Harvey.
The Bruins had the best defencman who ever played the game and had Eddie Shore who along with Doug Harvey are a shoe in for the 2nd best of all time.
You could argue Bourque is #3, but its debatable. I think Bourque is undderrated by many around here, he was an elite defenseman for 20 years, and the very best in the league for at least a decade, in a class of great defensemen. 5 Norris trophies in an 8 year span screams dominance.