You're going to be hard pressed to find a decent SR for less than $1700.
Definitely check out what JHOT has. They are a NICO sponsor and really awesome people to deal with. I was able to get an SR20DET Blacktop from them for $2266 shipped which included everything needed to get the car running (180sx fuel pump, downpipe, intercooler w/ piping, Blitz airfilter w/ intake piping).
http://www.jhotimports.com