9. Porsche 928 (1978-1995)

The Porsche 928 is a luxury GT car made by Porsche AG from 1978 to 1995. It was intended to replace the famed Porsche 911. However, the 928s were sophisticated machines and difficult to repair. So as years went by, the Porsche 928s eventually fell into the hands of third and fourth owners. During the past three years, higher-powered 928s have had their value skyrocketed. The most demanded ones are the newest and rarest cars, especially 928 GTS models from 1993 to 1995 that were powered by a 345 hp 5.4-liter V8 engine. The ones with low mileage have been given price tags with six figures.

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