It's that time of year again: time for the Neiman Marcus Christmas Book, which also means it's time to check out the badass limited-edition wheels they're offering. This year, it's the incredible NM Limited-Edition 2007 BMW Individual M6 Convertible ($139,000). Only 50 of these V-10 powered, 500 horsepower convertible beasts will be built, all in an exclusive Ruby Black color with Gold Brown merino leather power seats. Other niceties include an on-board computer, GPS navigation, an 11-speaker stereo system, and a trip to Munich to meet the engineers and designers who brought this beauty to life. Merry Christmas, indeed.