Your search parameters are not far from mine and I will follow your search closely.
I trust that I will be corrected if wrong, but I believe that the Tartan, Sabre and C&C all have cored hulls and decks. The PHRF numbers should be close for the Tartan and Sabre and both are a bit better than the C&C. All three will have balsa cored decks as well.
I believe that the decision among the three should be a function of the individual differences associate with the particular boat: owner, aux power, condition, history, etc.