stretch240sx wrote:agreed
Personally, I'd go $3500 for a REALLY clean S13. I'd try to get a Nissan tech to give it a really good look before I bought it too. A little bit of money spent up front could head of some major problems later on, if the seller is OK with it. If he has nothing to hide and he knows you're serious about buying, I don't see why he wouldn't let his Nissan dealer inspect the car.
If the mechanic finds a problem with the car, you can always use that to lower the price, assuming the problem can be fixed without too much trouble.
Hell, start at 3K and see what the guy says.