Love movie (and game) soundtracks, but I also love the "trailer music" groups such as Audiomachine, Epic North, Two Steps From Hell, Really Slow Motion, etc.
Also, good epic film soundtracks really help. And personally, I listen to a lot of Bonobo and similar artists. It is a nice, mellow sound that is great for getting the creative juices flowing I will listen to some Lindsey Stirling from time to time as well. And Wardruna. They do some stuff on the Vikings show, and it's pretty awesome.