September Malevolence, Ellis the Vacuum Child, Loss of a Child, The American Dollar, The Ascent of Everest, Because of Ghosts, Blue States, Te, Boy is Fiction, Grails, Six Parts Seven, Migala, Caspian, Clogs, Rachel's, Efterklang, French Teen Idol, From the Sky, Of Sinking Ships, Friends in the Mountains, Japancakes, We're From Japan and Joy Wants Eternity are ones that don't seem to have been mentioned and come to mind immediately w/o any itunes browsing. I can recommend all of them highly. Much of my 100gb library is post-rock/ambient music so if this list doesn't do it I can throw out some more.