Keep it and enjoy it, sounds like a nice unit. If you want to send something back to make money send a 240/260Z. They are nuts for them.
I think there is real interest at the moment for stockers, maybe there is some older money coming out.
Collectable 32s would be the N1's. Anything in dark blue. ADM's. Some of the crazy ones like the evolutions (theres one on here somewhere) and limited versions and to a lesser extent the Vspec2's.
FYI, there are 2 adms for sale. Both black. One has mods (silly boy) for $40k and the other is a stocker, very clean for $65k. Not a patch on their original asking price but still a very desirable car.