These are bands I know and have listened to (except ptw which I'm just starting on) but only on a song by song basis; even then it is limited. What are the best albums by: Coheed & Cambria (seriously), Explosions In The Sky, Poison The Well, Sed Non Satiata, Sigur Rós..
Also Saves The Day? I listened to them a while back and was not the least bit impressed but they seem to get a fair share of good criticism on here so I must have started in the wrong place.
Might have some more later. @ Odracir: I never really got into either band. I know their both legendary, though.