But if you want to losten some mlre death metal there is the Dimmu Borgir. I've found them by accident too because their strange name. That's Norwegian, means Dark Castle. The music is full of symphonic tunes mixed with snoring. A bit strange for me.
If I want to listen some more melodic metal, I'd rather listen Powerwolf or Sabaton. They are not death metal, Powerwolf is a Church metal, Sabaton is similar.
Wow, Symphony X is very melodic and progressive, I just listen the 'Pharaoh'