Should I trade Pujols, Kinsler, Haren, and Shields...?

no I don't think so Pujols will finish most likely first offensively if not first definitely top 5. Howard and Utley both have potential to be in the top 5 or top 10 but Haren and Shields (although Haren is struggling) are better than Hughes and Kershaw. It's very attractive but I think your supporting players on your team should be good enough for you to win.