The best way to do this is to separate into a few genre and album type categories, or else five is way too few albums to go around, and theres way too many good bands - this way its more fair to all the killer metal bands that there are out there (at least if you have any taste its fair, if you're geo you can listen masturbate to frampton comes alive on TGP with the rest of the boomers)
Even then, there's a shitload of killer stuff i'm leaving off
best trad/power normal albums
Mercyful Fate - Don't Break the Oath
Rage - Perfect Man
Virgin Steele - Invictus
Blind Guardian - Tales from the Twilight World
Scanner - Terminal Earth
Best trad/power Compilation albums
Iced Earth - Days of Purgatory
Running Wild - Riding the Storm
Grave Digger - Masterpieces
Stratovarius - The Chosen Ones
Gamma Ray - Blast from the Past
Best death metal normal albums
Necrophagist - Epitaph
Cryptopsy - None so Vile
In Flames - The Jester Race
Entombed - Clandestine
Death - Human
best black metal normal albums
Burzum - Hvis Lyset Tar Oss
Immortal - At the Heart of Winter
Emperor - In the Nightside Eclipse
Darkthrone - Transilvanian Hunger
Deathspell Omega - Si Monvmentvm Reqvires Circvmspice
best thrash metal normal album
Megadeth - Peace Sells But Who's Buying
Metallica - Ride the Lightning
Slayer - Reign in Blood
Testament - The Legacy
Anthrax - Among the Living
When you first posted, I was working out, so my hands were a little shaky. I accidentally hit the report button. I have never reported anyone, but when the prompt for why I am reporting came up, I considered writing: "Ignorance" Mostly just didn't want to waste @Monkey Man 's time
Report Geo for basic bitch taste in music lol