The three favorites that I posted are:
"Signs of Life" - Since it has no lyrics (except some hidden ones), the music is the important thing here and it sounds just good, though Cluster One is even better.
"Yet another movie" - The part between 0:50 and 1:10 is one of THESE Pink Floyd sounds, the hole song combines well with my visualisations and there are lots of "hidden" messages.
"Sorrow" - Though there are not many unusual and surprising ideas during the song, the ones that are there, are really good, like singing the same part in different melodies at the same time. And I still have not found out the third hidden message at 5:08...

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I don't know what I don't know, but if I knew, I still wouldn't know.