re: Which one of these cars would you rather have?

Sorry I'm getting into this late. Without having read all the posts...get the GNX. If it's original and in excellent condition, it's worth a ton of money.

You could sell the GNX and buy 2 or 3 Supras.

IMO, the GNX would be a collectors buy. Investment only. Very few original conditions remain. And the Supra, although can be heavily modified pretty easily, is just too heavy for a ton of handling excitement.

You could also add a last generation turbo RX7 and turbo 300Z to this list.