haha... just but the GSR manifold + turbo first lerz... i bought mine last time for 600 bucks... should be able to get it around there also (or cheaper nowadays). Intercooler nowadays so cheap, but new one only lerz... and do new intercooler pipings. =) yummy! =)
If u have emanage (make sure u have the ignition timing harness as well.. MUST have), then get GSR injectors. Should be able to get between 150-200 bucks.
Get fuel regulator if you don't already have... and at least a GSR fuel pump.
Thicker metal gasket.
BOV
Boost meter.
Intercooler.
Get these items first... then all that's left is the installation (and intercooler pipings customization + downpipe) and the customization of the steel braided hoses for turbo cooling (u're going to have to drill 1 hole on the engine head and 1 hole on the oil pan as well as custom made brackets for this)... and of course, tuning.
Oh... and of course, get a bigger flywheel... 8.5" ones (4G93/mivec flywheel)... and if u have the budget, a bigger radiator as well.
Oh... and if u got budget, silicone hoses. =Þ
Not sure if i missed anything else.