i paid about 13 200 for mine all up on road. That is a near stock manual m spec, with alarm, stereo, boost controller, turbo timer. Look around mate, go for the private sale I rekon, you can get the same for a lot cheaper, or for the same price one that has a bit done to it and in good condition.
Also, If you have that much to play with, have a look around for a 33 or a 200 sx - but y would ya, skylines are better