nope. You are just thinking what most others are mate.
I agree. Aiming for 400+kw is not gonna be cheap either way you look at it.
Plus after you go beyond 450rwkw things start to shit itself ie transmission, driveshafts
I like to keep the power levels (for Skyline GTR) pegged at 446kw / 600hp that's enoughto scare the shit outa you and maintain a good balance between power and reliability
But that's just my opinion