Kunitz-Crosby-Giroux
Stamkos-Thornton-St.Louis
Sharp-Toews-Duchene
Tavares-Getzlaf-Perry
Bergeron/Lucic
Keith-Seabrook
Pietrangelo-Bouwmeester
Weber-Doughty
Subban/Giordano
I think keeping as much chemistry together as possible will certainly help the team through the tournament. Obviously every one of these players is an undeniable talent, and would succeed with any line combinations, but having the familiarity, with the right supplimental piece will help.
Kunitz and Crosby will be paired together to start, I think Giroux is the perfect addition, he brings speed, quick hands, and plays a little more physical.
Stamkos is the purest goal scorer on the roster, and the chemistry with St. Louis is perfect, so add in the purest set up man and a big body in front of the net in Thornton, and I think that is the deadliest line the Canadians will have.
Toews and Sharp with the addition of Duchene can be a big point producer.
a 4th line, is some of the bigger bodies, that can bring energy.
Bergeron is the faceoff specialist, and Lucic can be put in against bigger teams (like the US) and I think Duchene would be the one replaced.