Blashyrk is one of the coolest videos ever!
A friend of mine had to vomit because he laughed so hard after seeing it (that really happend, it was very sick, his complete desk and keyboard was full)
I think their guitar sound fits the songs, but I like the sound of Damned in Black more.
To join the group of "Best Tones" posters:
Opeth-Deliverance (man, it's awesome, clear and direct, listen to Master's Apprentices)
Nevermore-TGE
Morbid Angel-Blessed are the sick (not the best production but I love the feeling and the guitar sound fits perfect)
Pantera-Vulgar Display of Power and the Great Southern Trendkill (Dime's guitar sound > everybody guitar sound)