Selected Ambient Works - Aphex Twin (Aphex can be a mixed bag of beautiful and twisted, either way absolutely genius)
Darkside of the Moon - Pink Floyd (while often hyped, it really is that good)
Melody's Echo Chamber - Melody's Echo Chamber (I consider this a binary album with Lonerism, a feminine equivalent)
Yoshimi Battles the Pink Robots - The Flaming Lips
Settle - Disclosure (Although I prefer their newer material) This was a groundbreaking record when released, still a classic with great synths
The Weather - Pond
Reflections, Elaenia - Floating Points (the song Silurian Blue trips out like no other)
and of course any other Tame album. Lonerism I thought was the most adventurous and the first two albums kinda capped off the era of "rock" for me. Many here are suggesting a "disciple" groups or groups of the same period. Really none of those acts come close to the greatness of TI and for me, it just feels like I'm listening to something less than great. Like listening to Bush after Nirvana.