I think I'm going to spend the next few days going through my (much too large) collection and making a "absolutely must keep" list. See how few games I actually would feel sad about losing.

There's a lot of "oh I haven't had a chance to play it yet!" and "this would be perfect for this very specific situation/player" in my collection that could likely be removed, and even more "yeah, it's enjoyable enough" games. I'm guessing if I got real aggressive with it I could cut out quite a bit.