Don't worry about centres because it's a really deep position in the FA.
Your D is terrible. You've got to move them up in your draft order and perhaps reprioritize them.
Draft LW early because there are 5 or 6 LW in the league who are really good. Try also to get guys with dual eligibility like Heatley, Nash and Marleau. Kovalchuk may be moving over to RW so he should get dual eligibility as well.