I think you already know the answer: maximizing $$ = retail sales as singles.
I'd start by going through the cards carefully to sort out every special variation (brand, factory, series, etc.) and make sure they are truly commons.
Pumping $$ into grading makes no sense unless you are pretty sure the cards will sell for more than the all-in cost to grade (don't forget that nasty postage both ways).
Put them up here first--no selling costs.
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