Radiohead are just plain amazing. They can take you through allsorts of emotions and I'll never tire of hearing them.
And, as mentioned previously, Sigur Ros make some superb soundscapes! Takk... is one of the albums of the year.
Anyway, just read the main question so:
Sigur Rós - Ãgætis Byrjun
Radiohead - Kid A/Amnesiac
Doves - Lost Souls
Elbow - Asleep In The Back
Super Furry Animals - Mwng (Giddy tracks aside)