Does size matter? Or is what's inside more important?

When I swapped out the old entertainment center for the new one, I was able to add two new bookcases to the living room, filling my heart with glee. But now I have a dilemma, as I have to decide how I'm going to fill these bookcases, and what I want to do with the rest of my book collection. I've got only one shot to get this right, because once the bookcases are filled, there's no incentive to go back and change things up.

[Poll #1625430]