As good as Detroit looks, I don't think anyone can stop the Senators. If they stay healthy, they are going all the way for sure. They have the experience from last year and knows what it takes both physically and mentally. Only possibly downfalls are injury.
Any team with Luongo has a chance but while I think they'll do well they won't go all the way. 2nd or 3rd round ouster for them. Not enough depth on the team to carry them. If the Sedin twins go cold, then they become the Luongo show.