Not reading any of this thread, I'm going to assume this is a noob thread, so here is a brief guide to what I like about Thrash (as I am, indeed, an authority on Thrash).
Metallica - Kill 'Em All
Exodus - Bonded By Blood
Slayer - Hell Awaits
Megadeth - Killing Is My Business...And Business Is Good!
Overkill - Taking Over
Dark Angel - Darkness Descends
Sadus - Swallowed In Black
Artillery - Terror Squad
Holy Terror - Mind Wars
Sabbat (UK) - History Of A Time To Come
Sabbat (Jpn) - Envenom
Onslaught - The Force
Sacrifice - Forward To Termination
Infernal Majesty - None Shall Defy
Ripping Corpse - Dreaming With The Dead
Blood Feast - Kill For Pleasure
Whiplash - Power And Pain
Anacrusis - Suffering Hour
Mekong Delta - Mekong Delta
Sodom - In The Sign Of Evil
Destruction - Infernal Overkill
Kreator - Pleasure To Kill
Living Death - Metal Revolution
Flotsam And Jetsam - Doomsday For The Deceiver
Sarcofago - INRI
Sepultura - Schizophrenia
Mutilator - Immortal Force
Vulcano - Blood Vengeance
Holocausto - Campo De Exterminio
Chakal - Abominable Anno Domini
Slaughter Lord - Demos compilation
Hobbs' Angel Of Death - Hobbs' Angel Of Death
Renegade - Total Armageddon
Sarcasm - Crematory
Turbo - Last Warrior
Kat - 666
I'll continue this maybe tomorrow.