I listened to Codex last night on vinyl - I love this album and it is the one closest to the first, as I said.
Brian Eno? The golden era for this artist is 1978 to 1984. Anything from then is great. My personal favourites include "Ambient 1: Music for Airports", "Ambient 4: On Land", "My Life in the Bush of Ghosts", "Fourth World: Possible Musics", "Apollo" and "Pearl". However, he's been having an Indian summer of sorts in more recent years, and some of these releases like "The Equatorial Stars", "Small Craft on a Milk Sea", "The Ship", and "Foreverandevernomore" are good too.
I highly recommend O Yuki Conjugate, especially Equator.
Have fun listening...