I heard the new SR-009 Stax at RMAF with a Blue Hawaii SE amp and was blown away. I don't really care for headphones much but this combo has changed my mind. The price is sky high but if I had to give up my speakers that is the headphone rig I would replace them with.
Just before trying the Stax I tried Sennheiser hd-800, Audeze ld-2/ld-3, and Hifi man 6's on a top of the line Apex amp. While I enjoyed those phones I did not feel I was missing anything.
If I could afford to spend $11,000 on the Stax, BHSE combo I think I would.