I highly recommend these binders & slip covers from Archival Methods. I have raw E-90, '34 Goudey, and '53 Bowman sets in them. They keep the cards very well-protected and I've never had problems with damage. I put a piece of black card stock at the front and back, and between each page, because I like to see each page on a black background - but this also helps tremendously with avoiding the pages sinking down.
Archival Methods