I read somewhere the new HFM cans would have revised connectors?
I'm not a fan of the headband but we'll see. I especially do not cherish the idea that the cups will be able to swivel 360 degrees ala Grado, considering the size and weight of the cups themselves.
HD800 takes it IMO. Dynamic drivers just attack better. The orthos don't move air the same way the HD800 does. I've tried this with HE-5LE (better than 500 in some ways), 500, and LCD-2. I will reiterate that it is not wise to sell HE-500's to buy HD800. These are both headphones you need to have side by side to really lock down how they sound and what makes them different.
Thing with HD800 is can you listen to them for six hours a day?
Theres a reason for both. Sometimes I need a break from the treble peaks..
The HD800's also exist as a reprieve from the ortho weight.. it's a perfect balance if you can swing both.
Honestly headphones are not the most expensive hobby if you do it within a little moderation.. It's actually the cheapest of my hobbies since I only really have to buy once and I've been sitting on more or less the same...