I really don't see a SP on your staff worth dropping, unless you wanted to drop Lester for a CL, but that puts you back where you were.
I think your starters will be fine and will provide you with plenty of wins. How many points could you potentially gain in wins if your starters went on a run? Would you drop any further in wins if you dropped a starter? How close to 3rd or 2nd place in the saves category are you? How many places could you drop if you went dry on saves?
Clemens will start picking up wins for you, the Braves are on a roll for Smoltz, Haren should do better in the W category. If you can package a starter to possibly get another solid closer and not a WW guy, it might be worth a shot, but I would stand pat for now.