What are the most valuable games you own?

[kupomogli]

Sealed steelbook version of Metroid Prime Trilogy is something recent.

I own over 500 retail games though, so there's stuff like Suikoden 2, Tactics Ogre (PSX,) Brigandine, Vagrant Story, Ogre Battle (PSX,) Ogre Battle (SNES,) Ogre Battle 64, etc, etc, etc.