Here's what I'm thinking:
Forwards
Stamkos - Crosby - St. Louis
Nash - Getzlaf - Perry
Eberle - Tavares - Hall
E. Staal - Toews - Bergeron
Couture, Giroux as spares
The 3rd line here could easily be Couture-Tavares-Giroux depending on production and injuries (Eberle and Hall aren't exactly bullet proof). Couture could even supplant Nash depending on in-season production. The Getzlaf-Perry duo doesn't really need any added size, so their left winger will need to be a good scorer.
Guys like Kunitz, Ladd, Lucic aren't complete enough players to make this team, or particularly good skaters for the big ice surface. Marchand stands a decent chance as he would be a valuable penalty killer and has familiarity with Bergeron, but the coaching staff (minus Julien) might be concerned about his discipline, which would negate his PK ability. In any event, expect Toews and Bergeron to take most, if not all, 3rd period defensive zone face-offs late in close or important games. They will also be feature prominently on the PK.
Defensemen
Weber - Doughty
Keith - Subban
Bouwmeester - Pietrangelo
Hamhuis, Letang as spares
I put Doughty, Subban and Pietrangelo above Letang on the RH depth chart (Weber is above them all, but he's played the left side for Canada before and we're lacking on that side). So, unless the coaching staff is willing to risk Letang on his off side, I think he will be a spare. Bouwmeeter has an edge in that he will have familiarity playing with Pietrangelo on his natural side, which he didn't get to play on Calgary, and he has a lot of team Canada experience. I put Hamhuis as a spare LH above Marc Staal and Dion Phaneuf. Kieth and Subban should be an excellent, dynamic pairing. Both are Norris winners and excellent skaters with tons of offensive ability. Weber-Doughty are just two of the most complete, big-minute defenceman in the game... easy top pairing selection IMO.
Goalies
Luongo
Price
Crawford
Luongo gets the starter position if he plays like we all expect him to during the season. If he has one bad game, or possibly even a single bad goal (depends how short the leash is), during the group stage, Price will take his place forever. Just like what Luongo did to Brodeur.