I'm a big fan of Audiomachine and their awesome soundtracks. Their music is used in many movie trailers lately. It is intense and keeps me on the edge. They don't use lyrics in any of their songs so you won't shift your focus.
One of my favorite albums is "Existence" and I've actually purchased all of their albums in CD version just so I have the highest quality ripped version of them despite having them also available on Spotify (I'm a subscriber) in 320kbps streaming.