Here's my list of ownership, prior to settling. For a few years now I've been completely happy with my hd6xx's and a fostex hp-a3 amp (but any SS amp is fine really). Of note, I had owned and sold them previously, and after cycling through much nicer gear, I went back and bought another pair and sold everything else. The ROI curve is real.

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Headphone ownership history:

Dan Clark Audio Ether Flow

Sennheiser HD800

Sennheiser IE800 (IEM)

Sennheiser HD6XX

Beyerdynamic T1 gen 2

Audeze LCD-X

Audeze LCD-3

Audeze EL-8T

Audeze Isine-20 (IEM)

Campfire Audio Vega (IEM)

Technics EAH-TZ700 (IEM)

Audio technica ATH-M50

Koss Porta Pro

TIn Audio T2 (IEM)

Etymotic HP3 (IEM)

Etymotic ER3se (IEM)

Yamaha EPH-100 (IEM)

Philips Fidelio X2