In my opinion I just wait off and save up the rest of the money to buy an actual R32 GTR instead of spending some of the mad amounts being mentioned here.

But to be honest, the best guide to sell it for is how much you paid for it. If demand has gone up, which it has then you can raise that figure but don't go crazy, be realistic and think would you actually pay the amount you're asking for it. As somebody might have sold theirs for one figure, but it doesn't mean you will sell yours for the same.

That is my experience of how these things go