Shin Megami Tensei. What you'll love about the games are the stories, setting, characters, music and art style. Brilliant stuff. I've only played the Tales games from the PS2, and they were just okay. Didn't really like the combat.
If you're going to start the SMT games, I recommend playing Persona 3: FES first since its the easiet SMT game. You can also learn the name of the spells and whatnot. Then play P4. Nocturne is very good and challenging in many different ways. Most of the time, it requires you to strategize and plan out your moves ahead of time. There is a ton of replay value for this game; there's about six different endings and over 100 demons to capture! If you like Nocturne, move on to Digital Devil Saga 1 & 2. The battle system is similar to Nocturne. Last is Devil Summoner: Raidou. This game isn't turn based like the other MegaTen games. The battles are very repetitive, and the combat could use some work, but the story is very good.
