My personal favorite of all times remains "Torture Machinist". It was released by Chaotic Noise Productions as tape. Then years later I re-issued it as CDR and again several years later finally on real CD since I just thought it was so good, it can't be "just" tape or cdr. It is not as brutally harsh or in-your-face as some other Ramirez, but also this is effort of bigger line-up, not the man alone.
I still wish Ramirez would go for more demanding and complex work's a'la Tracking Device, I Keep My Stuff Inside and the split with Alchemy of the 20th Century. He can do much more than routine wall noise jobs, so it would be nice to hear more structure works. He still has his own primitive take on it, which often is lacking from guys who solely focus on structured material.