Billed as the `must-have' automobile for the person who has everything, a posh Neiman Marcus-edition BMW M6 made its American debut at a special unveiling in October. Only 50 will be built, each featuring a custom Ruby Black exterior finish accented with Piano black trim elements, as well as power sport seats skinned in a custom Gold Brown shade of supple BMW Individual Merino leather. Wow. Even crazier, the $139,000 Neiman Marcus M6 sold out in one minute, 32 seconds, after going on sale high noon last October 18. Yes, those who have everything seem to have all the fun, too.