Here is the list of items i love the most at game and usually use them at my outfits...
Heroes' Crown of Faith
Requires level 80
Source: Naxxramas
Armor: Cloth (PRIEST ONLY)
Cursed Vision of Sargeras
Requires level 70
Source: Black Temple
Armor: Leather
Staff of Immaculate Recovery
Requires level 70
Source: Black Temple
Acherus Knight's Girdle
Requires Level 55
Source: Quartermaster Ozorg
Armor: Plate (DEATH KNIGHT ONLY)
Zhar'doom, Greatstaff of the Devourer
Requires level 70
