So I'm going to divide this list in to two parts, games I have played and games I have heard are good (but believed it enough to buy them =P)
Part 1: Wild Arms 3&4 Persona 3:FES&4 (FES is an expansion of sorts which adds about 30hrs of gameplay so good to pick up if you can find it but 3 is good on its own), Xenosaga 1-3 (As others have said 2 can be difficult to get through, but 3 is worth it imo), Ar tonelico 1(I only recommend this if you like innuendo in your RPGs... cause there is a lot of it), Final Fantasy X&XII
Part 2: Tales of the Abyss, Shadow Hearts, Star Ocean: Till the End of Time, Radiata Stories, Odin Sphere
As for the 360 I recommend Tales of Vesparia and Eternal Sonata
Part 1: Wild Arms 3&4 Persona 3:FES&4 (FES is an expansion of sorts which adds about 30hrs of gameplay so good to pick up if you can find it but 3 is good on its own), Xenosaga 1-3 (As others have said 2 can be difficult to get through, but 3 is worth it imo), Ar tonelico 1(I only recommend this if you like innuendo in your RPGs... cause there is a lot of it), Final Fantasy X&XII
Part 2: Tales of the Abyss, Shadow Hearts, Star Ocean: Till the End of Time, Radiata Stories, Odin Sphere
As for the 360 I recommend Tales of Vesparia and Eternal Sonata