I just got into Killing Joke this year, and I wish I had discovered Killing Joke much sooner. I hope I'm off to a good start with their music as I have gotten Night Time, and have thought about getting Brighter Than a Thousand Suns and Hosannas from the Basements of Hell next. I've also kept reading good things about their self-titled debut, so I'm definitely going to check that album out without a doubt too.
http://www.killingjoke.com/
https://www.facebook.com/killingjokeofficial
https://twitter.com/Killingjokeband
http://en.wikipedia.org/wiki/Killing_Joke