Hmm, I might have to take a flyer on the HD650 at this point. The 600 is fine at low volume (I use it when sleeping), but it's way brighter and forward overall than I expected. Thankfully the HD650 is as cheap as it is.
Edition 10 has a reputation as both an overpriced headphone and a very bright headphone. I ruled it out a LONG time ago.
Audio Technica seems like a good idea on paper, but the winged headband is a huge problem for me and I was not a fan of the AD2000x at all (again, very forward mids). I would consider the TH900 for a Japanese colored headphone ahead of the AT's, but the bass was a bit much during my trial period with it.
The Ether is tempting, but I consider the price somewhat inflated on it. Part of my love of the Mad Dog comes from the fact that its a value headphone that outperforms several other headphones well above its price range. No disrespect to Dan, but I'm not ready to commit that type of cash to his operation (especially since it is his first non-mod offering). I would definitely like to try one at some point though.
