The 1jz is the motor that comes in the soarer in Japan. The 1jz is the cheaper, easier route and good power. But if you go 2jzGTE you basically have a Supra. And advice don't go na-t, go with 2jzgte.

1jz: 2.5l, twin turbo ct12a's
2jz: 3.0l, twin turbo ct12b's