I purchase his works religiously. Have been since almost the beginning.
Nearly his entire discography, including comp tracks, is available at 
http://burialhex.bandcamp.comAs far as the early era goes, I've always been most partial to 
Gripster Killer. Many of his early works lean heavily on the 
Maurizio Bianchi side of things. 
In Girum Imus Nocte Et Consumimur Igni is a tasty piece from the early days as well. Rare use of loops, more high end at times, and plenty of variety while maintaining simplicity.
Also very partial to 
Goy Godal for being straight raw and lo-fi harsh noise.
Initiations covers a broad spectrum - industrial, harsh noise, ambient, tribal, almost-music-like moments.
Ghost Trio No. 1 is an insanely alien piece built around piano and shortwave radio. I do believe Clay is a truly trained piano player. This doesn't hold heavily in the realm of noise, except for the last few minutes which are strict radio waves.
Vedic Hymns definitely had help from the 
Kinit Her boys. A more classical lean. Very torturous and melancholy.
The Night and 
In Psychic Defense both contain his obvious love for dub, dance, ghettotech, whatever-the-fuck while being wrapped in the mist of his voodoo noise and some post-punk leanings at times. The man is certainly willing to experiment heavily.
Six Wings and 
Bagirwa Hymn are definitely my favorites of his recent output. Just a more fine-tuned version of his beginnings.
The tracks from the 
Iron Fist Of The Sun split are some of his best and unlike 
anything else he's done.