It's not a $200 pair of headphones, it's a $400 pair you are getting for $200. And as Jude said in his preview, he felt it was under-priced even at $500.
The pricing of things is chaos and often unfathomable. Items tend to go for the price they'll sell at, nothing more. It's not a good metric for discerning quality. Personal experience and consulting the experience of unbiased third-parties will lead you on a straighter path.
I own the HD600, and its capacity increases tremendously on better and better DACs and Amps. If the 650 is anything like it, I expect it'll scale well on TOTL gear.