Nanaki on 20 May 2010
Shin Megami Tensei. This mean: SMT: Nocturne, SMT: Digital Devil saga I and II, Persona 3 and 4, Devil Summoner. All for PS2
But I must warn you, these games are a little bit harder than FF.
You can try Xenosaga too (PS2), or XenoGears (if you don´t mind PS1 graphics).
Tales of ... are good too. So, Vesperia for Xbox 360 (and PS3 in Japan), Abyss and Legendia for PS2. Legendia isn´t that good, though.
