I would have happily paid $899 for my HE-500s. A lot of reviewers have mentioned that if it wasn't for the HE-6, the HE-500 would easily have qualified as a flagship headphone. And pricing doesn't count for much, there are more expensive headphones out there that definitely do not live up to their price tags (I'm looking at you HD-700). I can happily live with the HE-500s in the long term as they are such good all rounders. The Hifiman's do require proper amplification though to fully appreciate their sound. I definitely ran mine for too long on underpowered amps, not realising how great they really were.
good point, I do love a bargin but I can only afford so much at one time... sadly the Spring is my next big purchase date an that will include a T90 most likely and a balanced tube amp q.q the tube is gonna be one hell of a fun thing to find for uhh around $600