Be careful with Sheets....he's def a big time talent, but look who he plays for. He'll get you some K's and a decent ERA, but no W's. He's definitely worth a shot, especially with your staff.
Don't really like K. Wells, he's not someone who'll provide you with points. Also, try to get someone to take the Big Hurt, because that's all he'll do to your team. HURT!! Good luck