VK Group A, VL Group A, VL Walkinshaw, VN Group A are all obvious cars. Value of the VN Group A could end up the highest. These are all the last Holdens with any conection to racing thanks to V8 Super cars.
Then early HSV cars. Especially VG Maloo as they started the ute craze of the 90's.
sleepers will be any other Brock cars. I can see Magnums being highly valued.
I also agree that VN SS up to about VR SS will become interesting cars like the HQ SS has done.
Another sleeper may be the VP GTS. They were a real tribute to the bright in your face cars of the 70's.
No more cars will reach the lofty heights of the Phase Three I don't think, in value so far in front of its contempory cars that is.
It depends on how much throw away cash gen x has in ten years time I suppose.