I'd recommend you Shin Megami Tensei: Digital Devil Saga which is IMO better than Nocturne and if you like 2D graphics - Atelier Iris: Eternal Mana as well as Shining Tears. I didn't find Grandia Extreme too good so I agree with Exodus here. I played it for about half an hour and found it quite poor... First part was decent, second good but Extreme isn't good at all. Also Xenosaga is a must for a Xenogears lover, otherwise you might find it too overloaded with cutscenes and dialogues. There's also an interesting tactical RPG entitled Stella Deus, you could try it too. BoF5 IMO doesn't even stand a chance with great 2 and 3 parts of the series. It is a big unfortunate that PS2 has so less to offer in jRPG's matter than PSX ever had...