GT25R (GT2540) will get you there pretty fast, and make 400whp. Plus it bolts onto a stock manifold. The way to get there is this..
GT2540 (.64 A/R exhaust housing)- 1000.00Greddy o2 housing- 150.00Tial 38mm wastegate- 250.00Tial flange and welding costs- 75.00Dump tube- 25.00
You have a ballbearing turbocharger, that will make 400whp at around 18-19psi on a stock SR20DET.. spoolup faster than a 50 trim T3/T04E, and last 3 times longer. Compare the costs..
T3/T04E- 650.00Log manifold- 400.00Tial 38mm- 250.00Downpipe- 250.00Dumptube- 25.00Oil feed and drain lines- 75.00
It's pretty damn close...

Travis