From watching it constantly on T.V as a kid-teen i too love the Omen.
As to Polanski I really like Rosemarys baby, Repulsion and the Tenant, which are all thematically linked by the subject of paranoia.
Otherwise i think fearless vampires is a bit hit and miss, i like it but it's not amazing.
Chinatown was O.K when i saw it years ago and i didn't mind Cul-de-sac due to Donald Pleasence being in it.
Also quite liked his version of Macbeth.
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MIKE: I've got it! Peter Cushing! We've got to drive a stake through his heart!
VYVYAN: Great! I'll get the car!
NEIL: I'll get a cushion.