These are the games I own cases for. I have a few PS1 games in one of those CD binders.
Truthfully, the most I've played of any game to the right of Sly Cooper on the top shelf is like, 20 minutes of Resistance. I got some of them from a friend who was trying to get some money at the time. The PS2 games are all ones that are dear to me.
I also have a wall of Devil May Cry stuff. It's multiplatform these days, but mentioning it since it started on PlayStation.