Death Metal

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I'm into the chaotic side of Death Metal - you already mentioned most of the bands I like - Portal, Mitochondrion, etc.
to add a few, (might have overlooked them in the previous replies) here are some of my favs:
Teitanblood - I'm sure most of you guys know them
Swallowed - imho, a more doomy version of Teitanblood
Aevangelist - can't wait for their Split with Blut aus Nord
and finally: Antediluvian

All of the bands you mentioned are good, but I think Teitanblood is definitely the best of the bunch. I think Temple Nightside represents a bit of same kind of atmospheres as these bands, and it so happens that they've just released a new track out of their upcoming album: https://soundcloud.com/iron-bonehead-pro...al-entropy If you haven't yet checked out their debut album, Condemnation, I strongly urge you to do so!