6. Mercedes E55 AMG
In 1998, AMG released its ultimate version of standard E-Class in form of the E55 AMG. From the outside, the E55 AMG looked like any other E-Class with just minimal changes but underneath the body, there was a 5.4-liter supercharged beast just waiting to be released (via Mercedes UK).
With 349 HP and 391 lb.-ft of torque, E55 AMG could accelerate from 0 to 60 in just 5.4 seconds which was late 1990s Porsche Turbo territory. AMG built over 12,000 examples which makes them relatively plentiful today and you can pick up a decent example for around $10,000 which is a steal.