I would go with the Skyline or the S14. The S14 is an extremely well-balanced car, nice power too. If i'm not mistaken, it has over 200hp not as much as the 250hp S15, but i heard its pretty good. And i KNOW the S14 is great for drifting. The R32 is great for drifting as well, but i think it is always to have a newer car vs an older car. Less maintainence problems, and you do not have to worry about replacing anything internal anytime soon.
which skyline? gt-r or gts-t? also, the s15 is nice and all but its prone to have drivetrain issues (read too many of those in other forums). so i would stick to the earlier sylvias or the skyline, though i prefer the redtop sr20 due to its pentroof design.