It's not just the turbo kit. I've done about 4 or 5 of the VQ35DE turbo conversions ranging from 240AWKW to 660RWKW. Your supporting mods will be just as expensive as a HKS turbo kit to do it properly. If you do it yourself you will save big $$$.
IMO the best bag for buck on the street if you want approx 200RWK on a VQ35DE is a firstly a very well sorted and flowing exhaust with H/F CAT's(use Z34 headers and cat's), a Z33 manual diff(3.538) for those of you with the PM35 only as the PNM is already 3.538, fuel pump and good catch can setup. With those mods you should be able to get 180-190RWKW with good plug and play ECU like a LINK.
If you want more for a street car a supercharger is your next best bet. The supporting mods to make it work well and get you reliability. power will be about 220 - 240RWK.
Once you go turbo its a major game changer as everything needs to be adapted especially if your in the PNM35.
P.S. I am only talking figures with 98 Octane fuel for the boosted setups as E85 is another setup and power change. IMO is you have $20K put an LSA in it and say goodbye