Although admittedly I do like that blue one for $5,500.
It has done a lot of k's, but really, most Skyline's have, they've just had their clocks wound back.
I'd get a professional to check it out, and if those k's appear genuine and the car has been serviced regularly then that car is an absolute bargin for it's price.
Love the colour too, rare for a Skyline.
Edit: I do not know the seller in any way, shape or form. Just bored and making a comment.