3 – Audi A6
Audi’s executive sedan in form of the A6 was a popular model due to elegant styling, powerful engines, and cool-looking interior. Also, this model featured several signature Audi`s technical marvels like famous all-wheel drive, the mighty Quattro. Naturally, the base price was pretty high and the A6 starts at around $50,000 but today, you can find them for around $15,000, clean and loaded with desirable options and full-service history. That is more than 1/3 of the original sticker price for 6 to the 7-year-old car.