The major points in my Metal Progression. Have listed the first album I got into with all of them - but for most of them I love all their stuff.
Metallica (remember seeing the film clip for One on Rage. Blew me away. First four albums are great)
Megadeth (Rust in Peace, first, then all the albums before.)
King Diamond (Them/Abigail... Haven't listened to for a long time.)
Slayer (South of Heaven)
Faith no More (only The Real Thing is really 'metal', still love all of their stuff.)
Helmet (Meantime/Betty, again, depends upon genre interpretations, but I'm just going with 'heavy' music)
Then I discovered Death metal.
Obituary (Cause of Death. First Death Metal I'd ever heard. Scared the shit out of me.)
Sepultura (Beneath The Remains/Arise)
Entombed (Left Hand Path/Clandestine)
Pitch Shifter (Industrial)
Bolt Thrower (War Master)
Christbait (Yeast)/Bloodduster (Yeest)
More recently: Ghost (Opus)
Heaps of others, but they're the main ones. Still listen to them all.
Very similar bands to me there. I had a mate that was into Helmet and so I checked out Meantime and quite liked it. I never really knew where it fit in either.
As for the death list I've never listed to Pitch Shifter or Godflesh, so I'm not sure if I'm missing something there. I have listened to Deicide, and I could never get into it. I'm not sure what it was, perhaps even too heavy.
I haven't heard of Christbait either, but Blood Duster was always a favourite, mainly because they were Aussie and were quite funny. I say "were" because last time I saw them, maybe 3 years ago they were lame and unfunny. King Parrot put on an awesome show at the same gig.
King Diamond still puts on an amazing show if he comes to Aus. I saw them this year at Sweden Rock, very awesome. As was Dirkschneider(played only Accept songs), Entombed AD and The Hellacopters (not metal but Nicke Andersson is a legend). Slayer, although one of my favourite bands was terrible, don't waste your money.