Agree with most of the comments here.
7k for a 12 year old N/A Skyline is pretty good! I would of thought a bit less myself.
To put it in prospective, a good mate of mine & myself went shopping for a new car for him last Friday, now he has a rather nice 2005 Forester XT manual, luxury pack, the works 100ks full Subaru history etc etc.... average trade in price ? 12k!