Ah, 1984. Probably my favorite year for metal! I could list out my own personal favorites, but there really wouldn't be any surprises (Maiden, Priest, Manowar, Jag Panzer, Metallica, etc.)
So, here are some runners up not mentioned yet:
3rd Stage Alert - 3rd Stage Alert
Limelight - Ashes To Ashes
Lizzy Borden - Give Em The Axe
Mad Max - Rolling Thunder
Overdrive - Swords And Axes
Parasite - Parasite
Persian Risk - Too Different
Sacred Rite - Sacred Rite
Shok Paris - Go For The Throat
Also, lots of great comps released in '84!
Battle Of Metal
Death Metal
Dutch Steel
Iron Tyrants
Metal Massacre 5
New York Metal-84
Northwest Metalfest