Nice review. Very positive
In answer to your question:
B&W P9 $899
Sony MDR-Z7 $699
AudioQuest Nighthawk $498
Opp PM2 - DISCONTINUED
HiFiMan HE-560 ($899)
Sennheiser HD650 $499 (but usually about $329)
Shure SRH1540 $499
AKG K712 $399
Foal Elear $999
Fostex TH610 $599
Sennheiser HD700 $419
Audeze LCD-2 $999 (Can usually be found for $799 so we'll count them)
beyerdynamic DT1990 $599
beyerdynamic DT1770 $599
Blue ELLA $699
Audeze EL8 $699 (But can often be found for sale for $499... I'll count them anyway)
UltraSone Performance 880 $449
Fostex TH500RP $399
Sennheiser HD 630VB $499
Grado GS1000e $995
Plus some wireless models that have good reviews like the Momentums. Imagine I missed a few.
Oh, and now there is the Monoprice M1060, albeit open, but well under $499.
Just a few in that price range, so it's hard to accept "there really aren't many these days"
Sorry, I'll clear that up for you. I meant headphones priced
above $499 but below $999. I thought about clarifying further in the article, but I figured most people would get the point. You can think of it as $501 to $994, if you like. I put the prices above for reference.
So that cuts your list of 20 down to 9.
Being the bargain hunter you are
@Allanmarcus, I'm sure you're very well aware of the fact that about 5 of those 9 headphones can usually be found for $499 or less. So if we're thinking about it that way, that leaves you with the P9, LCD-2, HE560 and the ELLA. Considering you can pretty much always find the HE560 for a hair under $500 used these days, that's a little shaky too... so you've got maybe 3 or 4 in practical application from your list above. But I'm sure you already knew all that.
The real question is whether AEON is better than all of those 20 headphones mentioned above. I've listened to all of them except for the ELLA and the P9, but for the other 18, I can tell you that the answer is an unequivocal YES.