Predator bad blood is my favorite hands down. If you have a copy of bad blood # 4 you would be willing to part with I would be more than happy to take it off your hands.
The big three, Concrete Jungle, Big Game, Cold War. Also there was one, I forgot what its called, but it was a one shot with a Predator against some kid and it took place in the 50s.
Anything drawn by Chris Warner ("Concrete Jungle", "Big Game" covers). He did the best Preds in comics. I think he really captured the spirit of the character.