Few filmmakers have a problem when their work wins a coveted spot in the Sundance Film Festival lineup. But for Paul Rachman, word that his documentary about early American punk rock had been accepted to the 2006 festival meant he had to make a choice. His film, "American Hardcore," inspired by Steven Blush's book of the same name, was also accepted by Slamdance, the festival he and other filmmakers started in 1995 after receiving rejections from Sundance. Charles Lyons reports.