Still, 500-hp cars aren't cheap new ... Still, a V12-powered luxury sedan for under $20k is a steal. Twenty-three years separated the debut of the first and second-generation BMW M6.

It shouldn't be long before it starts making lists of cars with 400 hp under 20k, and it's a bargain. The Q60 holds value better and is mainly around the $30k mark. Your changes have been saved ...