just look in your local paper, autotrader or ebay. I just picked up a 92 SE-R for 1800 bucks in decent shape. I blew the motor (it had 185K miles on it) but i have a JDM SR20DE in the mail for 450 shipped. So that's about 2300 bucks for the car/motor. I then spent 800 bucks for a cai, header, motor mount inserts, strut bar, tune up parts, sub/box and NX direct port nitrous kit. I still need the progressive controller to run a 150-200 shot safely (the SR motors take 400 whp on stock internals) and a set of slicks which is about another grand for both which will net me a low 12 and around 350 whp for less than 5000 bucks.

Another alternative would be finding a 240sx and getting a S13 SR20DET swap for about 2000 bucks. Turn it up to a bar on the stock internals, get a 3" catback exhaust and you're in the very low 13's in a RWD turbo car (much more fun than a swapped honda imo) My friend dynoed 270 whp in his 240SX with a DET swap on about 12 psi.

You can read up on sr20deforum.com, se-r.net or freshalloy.com