Your latest bonus just landed in your bank account, so you decide to treat yourself to that Mercedes-Benz SL65 AMG you’ve been eyeballing since you were 12 years old. Congratulations on getting your hands on one of the gnarliest and most powerful AMGs ever built, but it wasn’t the best of that era. The less-powerful SL55 – a brilliant used bargain – was much easier to live with, sounded better, and was just as fast (both cars were limited to 155 mph, with no option to remove the speed limiter).