there is a large difference between screamo, growling, and rasps. you may think they are the same, but let me assure you they are very different. and the amount of skill involved would blow your mind, and it is very difficult to do endurance wise.
I dunno if I would count death stars as extreme metal, maybe a form of industrial.
Inflames, Equilibrium (specially the latest album Sagas), and Children of Bodom (other than blooddrunk) are good melodeath (or alterations)
For those of you who liked the female vocals of that inflames song, you should look into symphonic metal. There are many very good symphonic metal singers which are far from harsh.
If you like equilibrium check out Eluveitie, another folk twist on melodeath,
https://www.youtube.com/watch?v=iijKLHCQw5o
Add some trance elements with inflames, made by crazy japanese people and you got Blood Stain Child, very weird but they grow on you.
https://www.youtube.com/watch?v=2oi-8xl7uZs
If you like Children of Bodom try out some Norther...
https://www.youtube.com/watch?v=cOB5pkbQLZ0
What can I say, I know alot about metal... :D
btw, cannibal corpse sucks... :D