Well there are two obvious choices. If you want to just have like 220 or 230 horsepower. Just buy a JDM SR20DET and drop it in your car, don't even bother to rebuild it. Cuz chances are that the motor you get will be in pretty good shape. To build your SR20DE into a turbo motor, you would need alot of parts to make it work reliably (pistons, injectors, manifold, gaskets, and all that other stuff). You would be better off just to buy a SR20DET and dropping it into you car. Import Intelligence has SR20DETs for 2400$ which includes tranny, ecu, and wiring harness. They usually have less than 25,000 Kilometers on the clock and come out of Bluebirds. They say 10PSI will yield 205hp while 16PSI will yield 280hp which is max boost for the stock turbo. Shipping is 100$ to 300$.
Not to mention the absence of head aches that just swapping a motor will have when compared to building a turbo motor.
Not to mention that dropping in a motor would only take a day or two. While rebuilding the SR20DE into a turbo would take alot of time, so be prepared to deal with alot of downtime.
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1994 Infiniti G20 5 speed (rebadged as Nissan Primera)
K&N, Enkei Type 11 GML, JVC KD-SH55 Digifine, Pioneer Pear-mica components, 2 12" round things that bang and a 400W amp to make them bang. Coming soon: ACT clutch, new half-shafts, HKS superform springs, KYB AGX adjustable shocks, $tillen STB, 17" König Toxxins with Yokohama Parada Tires (P215/40R17).
http://gforces.streetracing.org/
"I wish Captian Archer was as much as a racial bigot as Captain Kirk"
-Burt Weed