Chrono Trigger, classic perfection, play this game if you havent already.
There is nothing quite like going through a game, beating it with your gear, then playing through the game again with the same gear and levels you achieved in the previous game!!! There are several endings to this game, and the ability to keep your stats and gear from the previous game just makes it all the more enticing to keep going to achieve all the endings.
This is one of those games I will base all other gaming experiences on and seek out something to compare to the enjoyment I received out of Chrono Trigger.