Haha, N1's are seriously rare! Hard to say what one 'goes for' considering they rarely come up for sale. Also, there are people that mock up stockers to look like N1's and sell them as a fake to decieve buyers.
A mint N1 would not be cheap. If you could get one for $25k then you should be very happy with yourself!
oh, just realised, this is my - 1,000th post!