10. BMW 635 CSI
Debuting in 1976, the new 6 Series was BMW’s entry in the Gran Turismo market as well as one of the most elegant coupes of the period. It came with a recognizable design, four headlights, and a big BMW grille. Also, they built the 6 Series on the 5 Series base featuring only powerful six-cylinder engines (via Hemmings).
The 6 Series proved to be popular, spending over 13 years on the market. BMW managed to produce over 100,000 of them, which are still sought-after models on the used car market. Interestingly, more than half of the cars they produced were sold in the USA. The prices are still understandable but soon those elegant cars will be out of reach.