Just added a suggestion for the Oppo M-3. Take a look and be sure to vote them up the list if a portable planar magnetic for under $400 is on your must have list.
http://www.oppodigital.com/headphones-pm-3/
I would REALLY like to see a Massdrop on the Philips X2! Not just because $300 might seem a bit high (Amazon and elsewhere) but because no one seems able to keep them in stock! Drop me some X2, please!
I bought the Audeze LCD 2 just before Christmas and received a Schiit Mjlonir and Gungnir. The LCD 2 is a stellar headphone. I bought the Sennheiser HD 600 from Massdrop a while back. That is a stellar headphone as well. The LCD 2 is my permanent use headphone at home. It is just damn good. I highly recommend it. I can't speak for the sound of the HD 800, but I can say the LCD 2 is the best headphone I have heard (so far). I highly recommend it.
Note: I have not voted simply because I do not have the money for the products at this time, though I still want them all.