In 2005, Logitech released mm50, a class-leading portable speaker system for the iPod, which was followed in 2006 by AudioStation, a similarly superb all-in-one desktop iPod speaker system. Last month, the company announced that it would discontinue both systems in favor of newer, better replacements: mm50 was being refreshed as Pure-Fi Anywhere ($150), and AudioStation as Pure-Fi Elite ($300), names designed to better reflect their purposes. Each…