Honestly, nothing at the moment.
I've been looking at a game for sale online but I ask myself if I'm considering buying it only because I have a place to put it.
At the moment, there isn't a game out there that really excites me. I've tried to cultivate a collection that's as diverse as possible and a lot of games are just too similar to what I already have.
But you never know - I might get bit by the bug again soon and find a game I can't live without.