I really enjoyed all 4 of the films you mentioned, if you like Giallo at all you should enjoy them, they are from the more well shot and groovy end of the spectrum, with some mental motivations, cool music and demented performances.
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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.