I don't know a great deal about Skylines but have known quite a few people who have owned them. For Japanese import cars, its worth finding a reputable specialist to check the car out before you buy. They have a great and well earned reputation as a GT car.
That said, lots have been tuned, detuned and the running costs are not to be underestimated. They aren't quite in supercar teritory but probably not that far off, stock parts are expensive and fuel / insurance / servicing can be costly.
that said, enjoyable cars and they will (usually) make you smile like a madman.
there are a few forums for them and the advice you will find on them will be invaluable.
That said, lots have been tuned, detuned and the running costs are not to be underestimated. They aren't quite in supercar teritory but probably not that far off, stock parts are expensive and fuel / insurance / servicing can be costly.
that said, enjoyable cars and they will (usually) make you smile like a madman.
there are a few forums for them and the advice you will find on them will be invaluable.