
My number one is probably (not surprisingly)my mint copy of Panzer Dragoon Saga. Yeah, it's a cliched choice, but it's the crown jewel of my collection. I also have other Saturn gems like Dragon Force, Magic Knight Rayearth, Shining Force 3, and a few more, but PDS takes the cake. My complete Snatcher on Sega CD is also high on the list.
That being said, I'm also really happy to own complete copies of Zelda: A Link to the Past and Super Metroid. Shadow Hearts on Ps2 and my complete copy of Lunar 2 for PS1 also give me the warm and fuzzies.