The 993. The last of the air-cooled 911s and in the mind of many Porsche enthusiasts the greatest car to come out of Stuttgart in the company's history. The Turbo was near the top of the 993 lineup, with only the Turbo S and GT2 above it. The 993 had a list of firsts for the 911, with all-wheel-drive and a six-speed transmission chief among them. The redesigned suspension meant that the 993 was far less prone to the 911s snap-oversteer, and with the above-mentioned all-wheel-drive, meant that the Turbo could claw pavement nearly as well as the supercar 959. This white 1997 911 Turbo has just over 18,000 miles and is immaculate inside and out with a fully-documented service record. For any Porsche fan, this is one to own — and prices are only going higher for these air-cooled classics.