I did something similar a few years back. For those near an IKEA, I highly recommend their Besta line for game storage. No fixed shelves and peg holes 1" apart, plus extra shelves sold separately lets you maximize the units well. They've added media sizes to the line since I got mine for single-spaced items, but the standard shelf is the perfect size to hold 1 normal, vertical DVD-size case, with a horizontal one in front of it. That way, if you find yourself needing to double-stack, you can still see each game without having to move anything. Or- I've found an assortment of storage boxes that fit well on the shelf, so you could always set things up that way too.