My first one had to be Lunar Eternal Blue Complete PS1 (ironically played the Lunar games in the wrong order lol).
Great game! I loved the extras, just for being extras and packed in with the game! I then bought Lunar Silver Star Story Complete PS1, but didn't actually play the first Lunar until I got a JVC X'EYE last Spring (2012), and found a $20 complete copy of the original. Still holds up today! I even went on a nostalgia rush and played Lunar 2 Eternal Blue on that system as well!