11. 1970 Buick GSX Stage 1
The 1970 Buick GSX Stage 1 is often dubbed the ultimate sleeper, blending luxury with astonishing muscle car performance.
Its Stage 1 455 engine delivered torque that rivaled any GM rival.
With production numbers under 700, the GSX has become highly desirable, with auction prices frequently reaching $180,000 to $250,000.
Collectors love the GSX’s rarity and understated muscle compared to more flamboyant GM contemporaries.