Well look, this seems like you haven't done much research because for a start you've got the rear housing wrong.
Also let's face it, you've asked for 450-500awkw. That's MASSIVE numbers. Which equates to MASSIVE cost, but you're concerned about the cost difference between -5's/GTX5's/2530's? Be more concerned about the huge dollar head you will need, the OSGiken gearbox, the big multiplate clutch, the expensive FMIC, the big fuel system etc. the difference in turbo purchase price is chump change compared to the rest of that stuff.
Just put normal -5's on there, wind up the boost and be happy. If you must have a bigger number to satisfy whatever it is that made you want those numbers in the first place, get the 60mm versions of the GTX-5's and you'll make mid 4's without too much drama. 63mm's will have more lag, but will add a bit more power of course. Forget 67mm's, it's way too much for your power goal.
Don't take any of that as an attack or as being rude. You want honest advice, there it is. That's all I have to say on this topic