Velociraptors, Deinonychus, Utahraptors, Dromeosaurs. Anything in the Raptor family. I always loved pterosaurs like Quetzocoatlus, Pterodactyl and Ornithocherius. I also love the land predators like Tyrannosaurus, Allosaurus, Eustreptospondylus and Spinosaurus. Not forgetting the herbivores, Triceratops, Stegosaurus, Diplodicus and Parasauralophus...