Interesting list.
I used to do this kind of thing. I had a long list of "perfect" albums, not because they were necessarily my favorite or from people that I thought were the best... nor even because I thought every song on the album was perfect. It was really more about which overall compositions I thought were the most consistent and perfectly joined together into a cohesive album whole. Opeth's Blackwater Park would be right at the top, as would Samael's Passage, the Deftones' Around the Fur, and Six Feet Deep's The Road Less Traveled. I'm not the biggest Deftones fan in the world, but I think ATF is an unbelievably rock-solid album, and while SFD was a fairly standard hardcore band in some respects, I think that album was perfectly done. Would take me forever to go through everything and list them all, though.