But...but...but...beyond #1 & 2 (really, tie for first), I don't know what my favourite albums are...that said, I'll take a stab at it. I don't analyze what it is I like about music so much, so taken with "what I could think of at the moment":
1 (tie). Pink Floyd, Animals -- this is one of the first albums that ever made me feel prescient -- like I knew what they were going to play next, even though I could never write something as brilliant as this, their writing was just sympatico with my sensibilities -- the perfect ebb and flow of rock and space of "Sheep", the majesty of "Dogs", just everything...also, I find this guitarsy album to be the perfect complement to the synthy...
1 (tie) . Pink Floyd, Wish You Were Here -- from the restrained fanfare synth line opening, to that first most perfect guitar note, to the Orwellian "Welcome to the Machine", to the groovy slower-melody-on-faster-melody of "Have a Cigar", to the campfire-style strumming of the title track, to the perfect closing of the rest of "Shine On, You Crazy Diamond", it just doesn't get any better than this.
I heard David Gilmour talk about writing one of the post-Waters guitar albums, and he mentioned that they had a formula -- about 50% instrumental (he was talking golden era). Instead of being repulsed by that, I realized that some of my favourite music is about 50% instrumental.
3. Talk Talk, Spirit of Eden -- I love the patience of this album, and putting "Desire" sort of in the middle, so it builds up to it and then comes down from it afterwards on side 2, separates it from any other album I've heard, post-rock or otherwise.
4. Rob Dougan, Furious Angels -- so morose. And again, offset by disparity -- "Drinking Song" offsets the rest of the album nicely.
5. Marillion, Childhood's End -- prog, intended to be listened in one sitting, it's about drinking and girls and finding oneself, this was the soundtrack of my divorce. Still, not as morose as you'd think. I've heard the demo...but they got it right with the final studio album, which was then recreated live on La Gazza Ladra.
6. In the Nursery, Hindle Wakes -- modern chamber music, fantastically lyrical instrumental music. I'm almost afraid to see the movie at this point.
7. Kraftwerk, Computer World -- synthpop perfection, from beginning to end.
8. Vangelis, Heaven & Hell -- instrumentalism, and yet again, offset in ~ the middle by a song. Goes from nightmarish dissonance to angelic beauty like no-one else (not even Mike Oldfield, one of my other favourites).
I'll arbitrarily stop there.