Lamborghini Countach,
Ferrari F288 GTO
Ferrari Testarossa / 512TR
Jaguar XJ220
Ford Cosworth Models
Evo I II or III
Impeza WRX STi GC8
Toyota Celica GT4
Mazda 323 GT-X or GT-R
Nissan Pulsar (Sunny) GTi-R
Holden Commodore VK, VL, VN
Basically anything Group A and some good 80's 90's supercars.
Also some Group B rally and Group C prototype action in premium would be quite nice to have.
Almost all of those are in GT5...