I have my mind on several other "dynamic" cans, the Beyerdynamic DT880, the DT990 (both 600ohm versions), the AKG Q 701, the Audio Technica ATH MSR7, and the Sennheiser HD600, there is also an odd one called the V Moda Crossfade M100. Then I heard about these Hifiman HE400i's which are a planar...