I've wanted a 360 since tales of Vesperia.
But...I had no $$.
Now that gen's ending i'll pcik up a PS3 and play the Jprgs there.
Wait until Nextbox is announced, then wait a little more until Ps4 and the Nextbox are released. The price for a Ps3 or a Xbox must be really low by then.
Then you should aim for:
(360) -> Lost Odyssey, Blue Dragon, Infinite Undiscovery, The Last Remnant, Magna Carta 2, Tales of Vesperia, Ninety-nine nights (not exactly an RPG) and some others. Project Sylpheed (Spaceship shooter, with a JRPG like story, mediocre reviews only because it's a 4-5 hour game), Too Human (It's Not JRPG, and labeled an Action Adventure Game, but trust me it's much more of an RPG then Nier or Mass Effect, and it's good despite the ratings)
(Ps3) -> The Atelier series, Ni No Kuni, a new Tales of game (Graces f and Xillia), Demon's Souls, White Knight Chronicles, Valkiria Chronicles, Folklore! and some others too.
(Multi-platform) -> Star Ocean: The Last Hope, FFXIII/XIII-2, Catherine (Puzzle), Enchanted Arms (it's okay)
(Wii) -> XenoBlade Chronicles, Fire Emblem: Radiant Dawn, The Last Story, Pandora's Tower, Tales of Symphonia 2
If owned both, then you've also got: Eternal Sonata, Dark Souls, Resonance of Fate, Nier...