I don't think any of my games are that rare, most seem to be overpriced but not actually rare (like PS1 RPGs such as Xenogears/Chrono Cross). I guess the rarest games I have are probably the early Suikoden games, Diablo: Hellfire, Persona, plenty of other SMT games (no idea which ones are rare if any), loads of limited/special/collector's editions of otherwise not so rare games. I just like to get what I play and get mint/complete/best edition (limited/whatever editions) of it and usually the OSG too, I'm a tool but I don't care :P