This is a hard decision but I have decided that my HE500 is for sale. It is in pristine condition and sounds GREAT! Not a thing wrong with this awesome headphone, I just have too many awesome headphones!
Purchased new from Moon Audio in May 2012 for $850.29, this superb HE500 comes with factory travel case, 5ft Silver Dragon cable (currently $305 by itself!), extra new velour pads and original Moon Audio receipt.
$525 price includes insured USPS shipping in CONUS but 3% Paypal fee is on you.