Added Allen & Heath, and adjusted the listing for Astello.
Every Top-End Product of Every Headphone and IEM Brand Currently In Existence (Current Noncurrent... - Page 8
The cheaper-end stuff listed on the forum is generally Wal-Mart and computer earbuds, but since they fall under the rules they still count towards the list. I don't know anyone who would buy them for sonics, but that still are included.
I started with mainly audiophile brands, but now I'm digging deeper to try to get every brand out there that sells headphones.