Postrock: Mono, God Is An Astronaut, The Last Days (listen to The Time Will Never Come Back!), Lights Out Asia Chillstep: Blackmill, Rameses B, Mr. Fijiwiji (the song Apathy is too awesome ) Trailermusic: Two Steps From Hell, Thomas J Bergersen, E.S. Posthumus, Audiomachine, X-Ray Dog (The Prophet!), Immediate Music (Surrender To Hope!!!) Game Soundtracks (too much): basically everything from Final Fantasy (love the ones from FF 12 and 13), Shadow of the Colossus, Deus Ex: Human Revolution, Journey, Flower, flow, Papo & Yo, Guild Wars 2, Movie Soundtracks: The Book of Eli, Sunshine, Sanctum, Gravity, TRON: Legacy, everything from Studio Ghibli, Kon Tiki, The Girl Who Leapt Through Time, Ghost In The Shell (and especially everything from Yoko Kanno)
Well these are the ones I would name right now. I'm sure I left out some major ones but yeah, these are actually the top for me.