Unholy Death Knight has one of the highest AOE potential, with a nice single target damage and [Ebon Plaguebringuer] to buff the raid, this increases the damage of magical spells by 13% and disease damage.

Talents for Unholy Death Knight Wotlk

Unholy DK Talents for Wotlk

Glyphs

Major

Glyph of Dark Death

Glyph of the Ghoul

Glyph of Icy Touch

Minor

Glyph of Blood Tap

Glyph of Raise Dead

Glyph of Pestilence