If you like the Heaven and Hell era of Sabbath then you'll love Dio's solo stuff
Motorhead are a mainstay, though Lem would spin in his grave at being called 'metal'
My fave album of theirs is probably between Overkill or Bomber, but the live No Sleep Till Hammersmith is one of the heater live albums of all time
GnR Appetite for Destruction. Not really metal, but one of the best debut hard rock records ever
Slayer, more of an acquired taste but did a string of iconic albums between 83 and 1990. Reign in Blood is infamous but Seasons or Show No Mercy are probably my faves
Megadeth, Rust in Peace, Peace Sells, Youthanasia albums.
Metallica from Kill Em All to Black album. Ride the Lightning easily their best, imo
Anthrax, Spreading the Disease. Great album
Judas Priest, loads of great stuff spanning 50 years nearly. Screaming for Vengeance and Painkiller are my fave two.
Deep Purple more hard rock than metal but imo one of the greatest bands of all time. Struggle to think of a release I disliked, but Machine Head is iconic.
Pantera - Cowboys from Hell, Vulgar Display of Power, Great Southern Trendkill. All class
Merciful Fate, pretty much anything of theirs is brilliant, but dark and weird. Falsetto vox take a bit of getting used to
They are my fave non-weird metal acts, probably