Back when Hollywood tough guys drove cars with as much personality as them, actor Lee Marvin ordered this GT500 KR convertible for his daily driver. We have the story on Marvin's KR and when it will cross the block.

Next weekend, Barrett-Jackson Auctions will try and sell a number of classic and contemporary Shelby Mustangs, including some truly impressive low-mileage specimens. Which of these cars will draw the highest bid?