I love the classic Universal Mummy. Love the shambling, cursed thing.
For Hammer Horror, Vincent Price as The Abonimable Doctor Phibes. Technicolor, shot more than 50% without synch-sound, with a crazy evil clockwork band. [Theatre of Blood is another good one, essentially the same premise (themed revenge) but with Shakespeare instead of Biblical plagues.]
But Godzilla is, and always shall be, King of the Monsters.