Recently I have been using a pair of Ultrasone ProLine 650 headphones, which have a remarkable spaciousness to them. This is due to the drivers being offset to the axis of the ear canal to simulate the HRTFs that allow accurate localisation. The overall effect is to provide a sensation that is more like being in a room listening to speakers. Ultrasone (www.ultrasone.com) is a relatively recent German company and is the brain child of a Dr Florian Konig. Some additional information can be found here <http://www.head-fi.org/forum/thread/204879/there-s-something-about-ultrasone/2895#post_2821957>. Sound-wise, I wouldn't rate them up with the Sennheiser HD800 (which sell for $US1400), but Ultrasone do make a comparable model (the Edition 8, selling for $US1500). The bass is full and tight. The downside is they are fairly heavy and get uncomfortable after long periods, so I won't quit my pair of AKG K240 II just yet.