if you PLAN to mod it, even the basics, BUY one with the mods already done
given its a buyers market you should get a few basic mods for a "stock" price
no one buys a stock skyline these days, its pointless
imho you should at least get a "stock" R33 with
wheels, ehxaust, intercooler, good tyres and maybe a piggyback of some sort
i would call that stock
STOCK ECR33 would be worth jack all
as in stock exhaust, std side mount, stock wheels