Albums I would add:
John Coltrane: A Love Supreme
Bjork: Homogenic
Haken: Affinity
Jaga Jazzist: Starfire
Karnivool: Sound Awake
Mastodon: Emperor of Sand
Peter Gabriel: Secret World Live
Porcupine Tree: In Absentia, Nil Recurring
sleepmakeswaves: Made of Breath Only
Tides From Nebula: Safehaven
VOLA: Applause of a Distant Crowd
Yes: Big Generator (for sentimental reasons)
Genesis: A Trick of the Tail, Seconds Out
Albums already mentioned that I agree with:
Marillion: Afraid of Sunlight, Brave, Marbles, Clutching at Straws
Genesis: Selling England, Foxtrot
Yes: Close to the Edge, Relayer
Rush: Permanent Waves
Queensryche: Operation:Mindcrime
Fates Warning: Parallels
Pink Floyd: Wish You Were Here, Animals
Mastodon: Crack the Skye
Metallica: Master of Puppets
Steven Wilson: The Raven That Refused to Sing