I store my collection in binders by block, 1 binder per block. Everything is in numberical order, 4 of each card max. Spare foils, rares, promos, etc get stored in a plastic card box with divided sections for trading fodder. I have a separate binder for my promos, autographed cards, etc. All my cards are kept in a plastic 72" high double-door storage locker. Spare non-foil commons go into the 5000+ count box abyss, I've got a few of those.