Pellet guns, you say. Fun target practice, though they're more dangerous than airsoft guns, so you should probably don some safety goggle. Unless you're willing to risk losing an eye to a ricochet. =P
As for the model... Well, can't name any, really. But i'm more of a rifle guy than a pistol guy. Rifles typically have better aim and more power.
pellet guns are usually more powerful than airsoft guns, just act retarded with them as predator said, cuz they can hurt quite a bit if u get shot in the right place (learned from experience)