Why would the Brooklands Green color have a lower "resale" value. According to U.S. production numbers there were only 29 made that year with black interior compared to 3 times as many in red/black. I would assume that there would be MORE of a demand for the lower production numbered NSXs.
That assumes that different colors are all otherwise equally desirable. They aren't. For example, when purple (Midnight Pearl) came out, there weren't a whole lot of those. But dealers had a tough time selling them, and some cars sold at a loss after sitting in the showroom for over a year. So scarcity alone does not necessarily drive up the price of a car.
With a color other than red (40 percent of all NSX's) or black (35 percent), resale value depends on finding someone who either doesn't care about color, or who wants that specific color. As a result, you're looking at a smaller potential customer base, and it may be a bit more difficult to find someone who wants that color. OTOH if you DO find someone who's looking for that color, you may actually be able to ask a premium for it.
I think the difference in price isn't that great though - there are some folks who would settle for a different color if they thought they could save a grand or two by doing so.
My advice is, you're going to be living with this color for a year - if you like it, get it, and don't worry about resale value.