busmute -- I used a Trek 2004 520 for three years before switching to my current ride (an ANT steel custom bike) and was very fond of it. Over the years I upgraded it with the standard commuting accessories (fenders, lights, panniers). I wasn't too fond of the saddle (most stock saddles suck) and swapped it out for a Specialized Body Geometry Indie. Also, swapped out the really wide Bontrager tires for a narrower set of 32mm Panaracer Paselas, which felt a little faster without losing any comfort.