Vosaiu, prepare for the ride of your life!
My all-time favorite game is Tales of Symphonia. Great story, memorable characters, the most "ADVENTURE, GUYS" soundtrack I've ever heard, and beautiful places make this a great game. I've played it through many times and am not at all ashamed that I can recite the opening cutscene by heart. For 100%-ers, some side quests can't be done until your second play through on the same file or later, so that and the depth and layers of the story (early in the game, Yuan, one character, says Lloyd, the main character, resembles something or someone. That ain't the wanted posters he's talking about!) and the Grade system, add replayability. And. Fucking. ABYSSION. Will make you tear your hair out.
Also the fact that in the affection system the main character is basically bisexual is awesome.