Not sure if this will be any help but i have just come across from wrx's and brought myself a nice clean r33 95 model ( this is my first skyline )
it has small mods like upgraded t3 turbo , locker diff , fmic , mines piggy back computer , running stock boost and i paid $12000
imo if i hade $15000 i would look towards r33 almost stock for around $10k - $12k and spend a few dollars making it yours ie wheels , body kit , fmic anything you want just so you can say it is yours
heres a pic of what i got for my $12k