I love this band. Other bands in a similar vein I have been listening to are This Will Destroy You, God is an Astronaut and The Faunts (the Mass Effect end song band). The Faunts have a more synthy 80's sound, which I really dig. I also have been listening to Caspian to a lesser extent but I think I need to give their album time to sink in.
Edit: About the epic thing, I listen to them while reading books all the time and it's fucking awesome. It's my main way of relaxing out here. Life is just better with an Explosions in the Sky soundtrack.