It's a hard one, there's so many great bands out there. It will be a long list, and I'll still have to leave some out. Some of my favorites are:

Devour The Unborn (I really dig their new stuff), Guttural Slug, Gutted Out, Traumatomy, Fight The Demiurge, Gutfed, Dynamite Abortion, Coprochephalic, Splattered, Necrambulant, Derogation, Abominable Putridity and Flesh Consumed. (No particular order)

And of course, some of the already listed above: old Devourment, Guttural Secrete, Katalepsy, Kraanium and Defeated Sanity.