Although it's been posted for over a week by now, I somehow totally forgot to mention this article on HeadFi. You can find it over at Confessions of a Part Time Audiophile. I tried many (most?) of the current sealed headphones under $400 and wrote about the ones I enjoyed. I'll follow up later with a roundup of flagship models which will consist of LCD-XC, TH600, TH900, and Alpha Dogs.
Note that I was specifically focused on over-the-ear models. I left out stuff like DT1350 and M80, even though I enjoy them, because that wasn't my target category. I also left out budget models like Superlux because that would make for a never-ending search to try more models. I kept it realistic.
Thoughts? Agree? Disagree? Let me know. There is actually more value in the segment than I anticipated finding, which makes me happy.