i would first start out with the turbo and manifold, do your research on them. Make sure it will fit properly, its a good turbo, it can handle the power band you want. Make sure the manifold isnt a cheap one that will just crack or wont flow properly. then go on to the intercooler and piping. along with your blow off valve and waste gate. then get a custom down pipe and find a exhaust you will like
Things to look for when buy a blow off valve is make sure the blow off valve can handle the power and its a sound you like. that goes along with the wastegate. I reccomend a tial waste gate and with a hks ssq blow off valve. i know that intercoolers are about the only thing you can ebay. they flow almost just as well if not just as much as name brand ones. Get the proper intercooler piping. make sure all the bends fit good. since your going to want to stay under 300 hp i would recommend just getting 2.00 - 2.25 inch piping.
You also want injectors that can keep up with the demand of the motor. As i just said since your going to want to stay under 300 hp, i would get 750cc injectors just so you are on the safe side. 750cc injectors are good for about 350 hp. and to get the fuel to the injectors get a walbro 255 fuel pump.
Also dont forget about looking into a clutch/flywheel, tires so you actually catch traction and a fuel management system