I'd recommend Elegy or Tuonela over Am Universum. Elegy, I think is the better of the two, but Tuonela is good too, just more use of clean vocals. IMO, both are way better than Am Universum.
Not impressed with the Circle of Snakes, I think the one before it I luciferi is much better. Can't say anything about the others because the only one I heard of is Entombed and I can't get into death metal, except Six Feet Under.
Six Feet Under is going to cover Ac/Dc's Back in Black in its entirety. Let the hilarity begin...
I was thinking dude, if you weren't too satisfied with the new Atreyu you should check out Odd Project. Sorry if that was late, I was just thinking about it today.