I did a lot of looking around the net about Skyline a while back. There were a few importers that dealt with Skylines. Motorex was the largest. The average price was in the $30-$40,000 range for stock R-32's and 33's, the R34's usually pushed into the $50's. And for insurance, you have to insure it like a collector car, antique and the like. Premiums are a premium. Another thing most of the one's I saw available for sale were right hand drive. A couple of sites said they could do a left hand conversions in the neighborhood of $10,000.
My take on the Skyline: Nice to have something that isn't in the mainstream, Insurance would be ridiculous, I could buy a couple year old Porshe for that kinda cash. Also getting financing would be a bugger. There are some companies that finance rare automobiles, Motorex said it had a couple of companies for series buyers. I would imagine you would have to have one hell of a credit rating, and a salary to boot.