Good point, Erasmus. However, I feel that salvation comes with some sort of action--say, the action of having faith in the divinity of Jesus. If this is the case, and we are predestined to either believe in this or not believe in this, then we at least do not have free will over that one action. If we have free will on that one action, then it cannot have been predestined.
The jump that I feel like making is that if one action/event is predestined (which seems necessary to me), all actions/events are predestined. That is, God cannot have taken away my free will when I was fourteen and became a Christian (predestining me to become a Christian so I would be saved) and then just given the free will back to me because I could subsequently become a non-Christian if I had free will and if the events weren't predestined. Therefore, "Predestination for one thing, predestination for all." My idea at least.