I'd take 5-10 of both your best condition cards, as well as your top star cards
(Mantles, key rookies). Grade those first, examine the cards closely before and
after they come back. This way, you'll have a better feel for how PSA actually
does grade, and you can make a better determination what cards should be graded
based on their criteria, instead of just your own inexperienced eye (based on
their standards, not your own history).