the newer swedish shit is doing the gruff/clean crap all the time. check out older in flames, (before colony), dark tranquillity (new one, or before projector), and first two soilwork albums.
if you want thrash, check out terror 2000. great vox, not too technical, but aggressive and fast and thrashing as all hell.
im going to also recommend destroyer 666. phoenix rising is amazing. great writing, playing, cool vocals. a little more 'extreme' than most thrahs, but he is understandable.
of course the haunted.
dewscented and carnal forge aren't very good i dont think.
get the new kreator
all check out hypnosia extreme hatred. great fuckin thrash with vocals that sound a lot like mille from kreator, of the sadus dude. is pissed off and super aggressive.
if you want mp3 samples of any of these, PM me.