I recently purchased a set of Ether2 headphones. They are ultralight compared to my LCD-X. The Ether2 is over your stated budget, but it seems Mr Speakers is constantly coming out with new stuff, and that might drop the price at some point. Senn HD800 is a nice headphone in your $1k price range, HD800s could be found on the used market too.
Brett, if you like the HD580 sound, give the HD 700 a listen too. You can pick those up at a decent price well under MSRP. They are smaller and lighter than the HD 800/800s. I have a set with Dekoni pads and they are nice cans.
I like the HD580 but they don’t hold a candle to the sound of the LCD-2, though I will keep the HD700 in mind. The 800/800S just might be too bright for my tastes. I prefer a more laidback vs. in your face sound.
Given the low price of the Hifiman HE-4XX from massdrop, a pair is on the way to try. I will either sell them for a small loss or gift them if they don’t float my boat. By the specs, I like that they are 10oz lighter than the LCD-2.
Received them today. First listen, I’m impressed. They are also significantly lighter on my skull. For as infrequently I use headphones, I think these will be my new go to pair.