1.) dont ever spend anymore money on ebay than you can afford to loose.
2.) I understand taht if you search for SR20 on nico you will get about 3billion results. but this is a topic that has been covered. Go spend some time searching around, reading up on
http://www.srswap.com and
http://www.phase2motortrend.com has a good FAQ.
To answer your question directly YES it can be done. NO it is not as easy as the other SR swaps. I wouldnt even want to think about the wiring. you need the rear differential and driveshaft too as far as i know (because of the location of the speed sensor). In the end money & time are the real answer.