I am currently doing an NA-T forged build, and have built the block to handle 1500bhp and just had all the head ported & polished, I will be going for the Whifbitz na-t kit but my end goal is around 1000whp.
End of the day you need to build the car to what you want from the car, and I know loads of people say the W58 is always the weak link but like comment above if go gte engine once push is it over certain power it’s still a weak link.
The R154 and V160 are very expensive options but there are better cheaper options out there.
People always say NA-T is a waste of money and always better to go GTE swap but that’s only because we are so far behind the times over here in UK, I mean none of the big supra specialists even offer built GE heads, just look at some of the Australia and USA 2jz-ge options they offer so many different types of manifolds plus they do front facing inlet manifolds with different throttle body options aswell.