These looks mysteriously similar to the set Alex is selling here:
http://www.skylinesaustralia.com/forums/Ra...ri-t301816.html
I hope for your sake that this person is genuine.
The price differences between the S14 and S15 have really dropped recently. You may be able to find an S15 around your budget but it generally will not be in the best condition. A good condition S14 is probably more realistic.