In terms of albums:
F#A#Infinity by Godspeed You! Black Emperor
https://www.youtube.com/watch?v=XVekJTmtwqM Dead Flag Blues
Sings Reign Rebuilder by Set Fire to Flames
https://www.youtube.com/watch?v=YiPZY5pefU8 Love Song for 15 Ontario
Deathconsciousness by Have A Nice Life
https://www.youtube.com/watch?v=2UeLngGTPHs Deep, Deep (albeit a less post-rocky track from the album)
Magnog s/t
https://www.youtube.com/watch?v=o70v28elaqw A Moments Seam
Hoping for the Invisible to Ignite by Farewell Poetry
https://www.youtube.com/watch?v=dbapKMNoUbA All in the Full, Indomitable Light of HOPE pt. II
Ágætis byrjun by Sigur Rós
https://www.youtube.com/watch?v=bxEU3h0Yqis Olsen Olsen
Soundtracks for the Blind by Swans
https://www.youtube.com/watch?v=2NOc1Gnu18I Helpless Child
Still have to listen to Spiderland which everyone tells me is incredibly great. Godspeed's entire discography is great, as well as Swans' post-rock stuff that started from the mid 90s to now. The beginning of Sleep from Lift Yr. Skinny Fists was probably the single most powerful moment in music for me when the old man finished his dialogue.
"they don't sleep anymore on the beach"