Fantastic thread. To bad it couldn't be updated. But I'm going to assume the readers have had lots of experience with all kinds of headphones. I own the Audeze LCD-X (which I've found to be a bit to warm; I prefer more sparkle), Sennheiser HD 800 (which is too bass light for most of my music tastes) and the Sennheiser HD 650 which I've had the longest and enjoy the most. My HP amp is a Violectric V281. I run all my headphones balanced with their stock cables. I want to upgrade to a headphone with lots of air, details, accurate sound staging and separation. Considering I'm really loving the HD 650 sound signature what headphone would be the next logical step up? Personal experience please. Thanks.