What PSA 8's are in demand from the mid 1960's?

PSARich

I normally send in cards for grading that I think will warrent a "9" except for HOFers and older vintage. However I have several thousand commons from the mid to late 1960's (baseball) that are mostly NM to NM-MINT. I bought these back in the early 1990s. I'm thinking its time to grade some for the purpose of selling them and then buying PSA 9's I don't have. I'd appreciate you 1964-69 baseball set registry experts sharing what the highest demand cards are in NM-Mint "8" condition. This will help me determine the best of what I have to send in for grading. Thanks to anyone who has good expertise in this area and is willing to share it!