Q my friend, are you selling your car? Bro I understand how people believe in sentimental value and how much work you put into your car. Your car is a perfect clean Z. If what you want is the KGC10 and you find one in good condition, do it. you can always find z, but a gc10 is the U.S. is just almost unheard of and they are sexy.
run your numbers right, your car is one of the finest and if you are selling it you can get every single penny that you spend back. I love my zx and my S14, but I always like first gen Z and I needed the money for the project... Obviously you are ready to move on...