Clearer Death Metal Vocals.

I don't know about anyone else, but Aeon's Bleeding The False is pretty easy to understand. Which is probably precisely the point.

Arch Enemy is pretty clear as well, as are Monstrosity, Paths of Possession and Bolt Thrower.
 
Most old school death metal is pretty easy to understand because they usually don't use the ultra low guttural vocals.
 
New Nile/
Only as compared to their older stuff...

Testament - The Gathering (more death/thrash, but w/e)
Kataklysm
Dew Scented
Bloodbath - Nightmares Made Flesh
Vader

Johan Hegg is a beast! Can't think of any death metal vocalists as comprehensible as him.