basically, I'm looking for brutal/tech DM bands with vocals like Benighted's. Or even vocals on stuff like Psycroptic's Symbols of Failure album.

no slam or goregrind please, just incase. xD

I'll recommend Weeping Birth. He seems to be what you're looking for.
I'll also throw in Detrimentum and Azarath.

Weeping Birth: http://www.youtube.com/watch?v=HhvZEdM8jmY

Detrimentum: http://www.youtube.com/watch?v=lIkh7D467D8

Azarath: http://www.youtube.com/watch?v=GRNaF2Sxky8

Aborted , Akercocke , Cephalic Carnage , Dying Fetus , Intestine Baalism , Kronos (Fra) , Lord Gore , Lykathea Aflame , Cryptopsy(first two albums) , Cattle Decapitation , Augury , Defeated sanity , Emeth , Excommunion , Fleshgore , Malignancy , Origin , Weeping Birth , Scrambled Defuncts , Sickening Horror. That should be good for now.

And Recueil Morbide more or less just like Benighted but just as good.