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Sean
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I just pulled a quick image from another site to help as a reference for the design only - Now why would you have 2 thermal breaks? The reason you do a hot roof is either necessity (cathedral) or the attic becomes part of the conditioned space for ducts, etc... The vapor barrier should not be required in either option, but I am not fully sure on #3

Sorry, I also should have specifically stated that the foam was not needed under the rafters in #3 also. #1 & #3 are the only code tested and approved methods #2 as you wrote it is not (no matter what the salesman states - if they say it is, have them provide the proof not a sales brochure)

Have you reviewed the buildingsciences web site - they have a lot of good info & will help make better informed decisions
 
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