I dunno Muckson, I'd try out the Kenzan demos (there's two of them) off the J-PSN store before you buy it. I thought it sucked.
I'm not really sure what the hell is going to appeal to you on the PS3 other than MGS4, really. Heavenly Sword might be worth a rent. You got Ninja Gaiden Black on Xbox so no real need for Sigma, especially with NG2 coming in just a few weeks.
So it's really kinda bare bones. You might consider getting Battle Fantasia since it will be free to play online and you don't want Live Gold anymore, right?
I still use my PS3 mainly to play PS2 games and for some movies (Blu-Ray selection sucks balls here or I'd have a lot more). Really the only PS3 game I load up anymore is Warhawk every now and then. I'd say try UT3 too, but you don't like FPS games anyway. You might like Uncharted. There's a demo for that you can try. Heavenly Sword too.
There are rumors floating around that Kenzan is coming to North America in the Fall. So, unless you read Japanese, I'd wait.
He can read and speak Japanese.