I wouldn't like to pay awful lot more than a pair of HD 650's. I really can't spend thousands for a pair. Was kinda balancing AKG and HiFiman in my mind.
I've been looking at those actually. The only problem seems to be the European pricing, making the headphones cost 200€ more than a pair of HD 650's. This is thanks to someone thinking €=$, which would make HE-400i cost $632 and the HD 650's cost $375.