If I were to drop any one of your WRs it would be Hines Ward. That being said, does McCluster have dual eligibility in your league (RB/WR)? If he does, thats who I would pick up.
I would rather start Kolb the rest of the year than Newton for a few reasons. Kolb plays in a far worse division, Kolb has better weapons to throw to (Fitzgerald) and Newton may throw for 20 TDs but he is going to throw for at least that many INTs as well.