350kw for work and back, hmm
In the 2 and a half years I have owned my GTR I have put about $20k into mods and I haven't touched turbos or internals yet, not even cams.... ouch! . Most of the cash has gone to the little things like recently wheels, nuts and coilpacks (on their way) also clutch, fuel system, cam gears, radiator, power fc, boost controller and then theres the non-performance gaining cosmetics .
Good luck either way, hope you reach your figure with a few dollars to spare to afford a beer to gloat over it when your done.