GNs were cheap in the mid 90s and have already started going up, thats why I didn't list them.
A T-Type is about as good to me, but a collector in the future will have to have an 86 or 87 GN.
GNXs are already stupid expensive, but they were like a 30k car in 1987
There might be a market for Ford Lightnings, nice Hemi Rams, and of course that Viper V10 Ram (hell I dont pay attention to trucks but I'm sure someone does). Historically we dont have anything to base it on other than what happened in the 1970s when gas guzzling muscle cars were 2-10 years old and could be picked up for nothing because no one wanted to put gas in them.
The latest Mustang Cobra, but those are still dropping in price, and this gas spike should cause the bottom of them to fall out. Why would someone want 390 supercharged hp (just a pulley and chip away from much more) when they could have a hybrid or diesel VW?
Kids had ZR1s and Vipers on thier wall, and these can be picked up for under 35k now (probably less if you look, going off the top of my head).
Some 911SCs from the early 80s are less than 15k but many are basketcases. I'm not sure if they'll have collector value. Perhaps the Targa models, C4s, and of course Turbos will though.