The black one definitely appears to be the best deal, imo. Good price for a Vspec II, which gets you the nice black seats and diffusers.
Just make sure you're very thorough - i was in the exact same position as you. I enquired about many, many cars, and some guys even refused a mechanical inspection. And for me, personally, i wouldn't buy a car without looking at it. I flew over to Brisbane to look at my GTR, and it was well worth it.