Any groups like Orbital or Underworld?

I love Orbital and Underworld. They're two of my favorite music groups ever. I love their style of music, especially how Underworld abandons continuity or even sense in their lyrics, going simply with the sound and the flow.

Can anyone recommend some good acts like Orbital and Underworld? I don't like vocal too much, so the less people singing, the better.

if you're looking for something outside of electronic music i highly recommend Godspeed You Black Emperor and Soundtribe Sector 9(STS9).  Otherwise, the more ambient Future Sound of London(FSOL) is good and i like a variety of Chemical Brothers productions.  And although i haven't heard a lot of them, i've been liking different things from Cafe del Mar.