In rounds 1-5, I think CarGo is a no-brainer. He's young, hits in a friendly ballpark, has offensive firepower around him, and can also run. Then you have a decision between Halladay and Heyward. Halladay is about as steady as they come, but Heyward has a huge ceiling. Personally, I would go with Halladay. This is because, in rounds 6-10 you have two more young, stud outfielders in Bruce and Stanton. They both have a lot of power, and could make the loss of Heyward not seem as bad. For the rest of your roster, you definitely have to look at Pineda. He has been tearing it up this year, and is also very young. I love his stuff. Then I'd look at Hellickson and Kennedy, leaning towards Hellickson.
So, if I were you, I would go: