It costs a lot. You've got a GA16DE I'm assuming. You'll need an ECU, ECU bracket, Harness, CV axles, Tranny, Engine, mounts, P/S pump and lines (if you have P/S), water pump. That's most of the big stuff. It'll cost you about $1600. And if you're really going to do it, buy a Japanese Spec engine, it'll cost you about the same as a US spec one. I've been reasearching a swap for about 9 months now and I realized that I can just buy an SE-R and save myself a lot of headache and money, plus have 4 wheel discs, better interior and instrumentation as well. For about $1600 you can buy a SR20DET with the T25 turbo and top mount intercooler. That'd be a bluebird motor most likely, or you can get an Avenir SR20DET with the T25 and no intercooler for about the same price. Or if you're really daring you can put a GTI-R SR20DET with the T28 on it but doing that one yourself would be tough to say the least. Get an SE-R then contemplate a swap.
You would have to have the computer programmed for 500 at JWT
Or buy an SR20DE ECU for $100