Goalie: The two obvious choices are Montoya and Schwarz but I am looking for Jaroslav Halak to have a good tournament. The Canadian goalie, whoever it turns out to be should have a good tourney due to the stingy defence in front of him.
Defense: Suter and Phaneuf are the two top defensemen in the tournament without a doubt. I look for guys like Lyamin, Fransson, Weber, Meszaros and possibly Smid to perform well. I could see Kindl being somewhat of a disappointment.
Forwards: This tournament certainly doesn't lack top end talent up front. The list is endless: Crosby, Bergeron, Carter, Stewart, O'Sullivan, Fritsche, Ovechkin, Malkin, Radulov, Olesz, Tukonen, Nokelainen, Korpikoski are all candidates to be named to the all-star teams. Sleeper picks that I can see doing damage are Voloshenko, Perry/Colliton, (whoever plays with Crosby and Bergeron is bound to rack up points) MacCarthur, Petruzalek, Callahan, Ruzicka, and Eriksson.
My tournament all-star choices would be:
Montoya
Suter-Phaneuf
Ovechkin-Bergeron-Crosby