whats the crack with 16v turbo?

[Bean]

The power itself isn't the real issue it's the increased torque of a turbo build that will drastically decrease the life of your drivetrain.
With an ITB build you'd struggle to get 240whp that's pretty much up there with the most powerful NA 4AGEs in existence (so difficult and very expensive).

If you really want to achieve good value and some sort of reliability I'd aim lower with the power or consider a different engine all together