Kyle Lowry. Fully healthy season, under a coach with the same philosophy, and being 'given the keys' to the team. The guy is VERY capable of earning a reserve spot on the All-star team, not to mention, his name will for sure be on the ballots, and will be watched.
Demar Derozan is my 1A, only because he bulked up significantly, added a capable handle, improved looking jumper, and familiar with the team concepts and systems. Demar really had a disappointing season. After being on the bottom, the one direction is up for him.
Bargnani could be there as well, but the difference between him and the other two, is he's always been capable of being a scorer and offensive threat, it's all about improving at the effort part of the game.