If you are not itching for the HD800S after demoing it, you really ought to give other headphones a try such as Senneheiser HD580/HD600/HD650 series or any one of headphones from the Stax Lambda-series.
Forget flagship headphones. The performance vs price just isn't there. Technology has improved greatly, but upper management has been treating headphones like veblen goods the last 20 years. So, performance has stagnated and prices skyrocketed. The price of flagship headphones these days are utterly ridiculous. Still, that is what you get when there are plenty of audiophiles out there with money to burn.