Why would you purchase a turbo that hasn't been proven? The "billet" wheel....yawn. Look at the DOM3xtr....I know Vim loves his turbo but its not all what its cracked up to be.
Why not get a 20g that you know works? I'd save a few bucks and look into a BNR built turbo....rather than pay for the Blouch name. Take the money and put it into some supporting mods....for whatever reason you're swinging on HKS nuts, not sure what thats about but you can SAVE some money on products that would (will) work better. I'm not sure if you're getting a deal or "sponsored" (by the looks of the pricing you posted you are not) but take a look at GT Spec, Maddad, Tomei, Titek, Tomioka etc...they are all the same header, just rebranded. If you are spending the money you may as well get a header that has an uppipe included. Good luck with your project, happy modding.