Rob , I am on geoffs site and have seen them all.
Yes it is cheap but that is relative. An 89 GTR is getting on . I have a 92 for sale for $28K with fruit and it is here.
I would be prepared to spend some money on a 89 GTR cos it will need a few things ( clutch , d/shaft boots , brake discs , top arm bushes etc )
Cheers
Ken