Headphone inventory: Current: Sennheiser HD580, Alessandro MS1 Past: Sennheiser px200, Koss KSC75   I've recently moved cities/job, and have started walking 30minutes to commute through a busy city centre. I used to have the Sennheiser px200 for a similar purpose when I rode the subway, and I remember it doing a nice job. I wasn't too keen to stick IEMs into my ears, so I looked for a portable, closed headphone.   Although the px200 had a beautiful, mellow mid range that was amazing with saxophones, it was hampered by a recessed bass...