12: 1970 Buick GSX
Also based on the same platform as the Oldsmobile 442 and the Chevelle, the Buick GSX is a car that’s worth considering. The car has a lot of unique features that were incorporated to separate it from other cars on the platform. Buick is more of a luxurious ride and the GSX was designed to follow this scheme. Not to be confused with the Skylark that it shares its sheet metal with, the GSX was a more focused sports car.
There were only 687 examples of the GSX that were put into production, which makes the car quite rare. The Buick GSX was synonymous with incorporating luxury and performance into a single package. While this is the norm these days, back then it was rare for a car to be both luxurious and perform well at the track. Values for the GSX have been exploding as cleaner examples are becoming harder to find.