HiFiMAN HE-1000s.

I heard the HiFiMAN HE-1000s and Axpona and I was ASTOUNDED*. These sounded absolutely PHENOMENAL. The word "perfect" comes to mind, as absurd as that may sound.

*I brought my own Parasound Z CD player, CDs, cords and connectors. I also had my own headphones, the Denon AHD-7000, with Lawton modifications (which I still love). I even brought my own headphone amp, which is an Audio GD Compass (I now own an Oppo HA-1, which I ordered after Axpona).