Hey mate ,
Every time i buy a car i send it to my local Mechanic , Does the Usual Compression Test , Leak down test , Does a check on the whole car, Brakes , Oils ETC , Also Runs it on the Dyno to make sure all is well , Now im sure alot of people dont do this , but i Can tell you its worth it paying $200 bucks to get it inspected Properly ,last thing you want is car to blow up on you on the way home , Atleast then mechanic can tell you all the details , and off you go , I would be mainly worried about the motor most as that is most expensive part to rebuild , And Price Wise Anyhing between 20K- 27K For A R32 GTR , And honestly id rather buy it from a private seller, There always cheaper and usually dont talk sh** like car dealers ..