I would go for the 360 because:
1) $150 cheaper
2) The PS3 games you listed are far off on the horizon and there will likely be another price cut before they release
3) The 360 has many other games available right now that are worth playing, no matter what genre you enjoy (excepting platformers)
You seem to like JRPGs... You'll want to look into 360 games like Blue Dragon, Eternal Sonata, and Lost Odyssey. The first two are released while Lost Odyssey is less than two months away. Next year, you'll also see Infinite Undiscovery (name... hurts... brain...) and The Last Remnant.