How deep is the league and what's the scoring format?
Assuming this is a 12 team or more 5x5 h2h league I wouldn't change a thing other than benching Cantu for Helton.
I was going to suggest dealing Roberts or Rollins in a shallow league packaged with a player to upgrade at a position but honestly I like everyone on your team at this point too much to even suggest that. I'd just stand pat. You've got several guys that are stepping things up this year (Wright, Dye, Morneau, Kazmir, Liriano, Weaver, Reyes, Fuentes) but all of those guys are for real. No reason to try and sell high on them.
Hope springs eternal
grows like ivy on the vine
then dies in the fall
--Haiku for a Cubs Fan, The Loveable Losers