as far as i know the only place to import and convert a skyline to the us is Motorex and they charge a fortune... A member of this forum asked them how much it would cost to transport over, register and leagally convert his R34 and it was in the reigon of... are you ready... $25,000 On top of the car cost.. Holy Cr&p!!!
2 Site Sponsors, Abbey Motorsport & Prospec (Shin on this forum) can source Skylines from Japan I believe.
The only official Nissan Skyline dealer in the UK is Middlehurst
If you are looking at buying for export to the Usa you are probably better off buying in Japan as we have to pay Tax and Duty when importing cars from Japan to the UK (though nowhere near as much as in the USA)...