Are you talking about Autechre? If so then there's no consensus about what their best work is, but here's IMO a pretty good cross section:
http://www.youtube.com/watch?v=3gr11QeD7mY
http://www.youtube.com/watch?v=patWgtO-mx0
http://www.youtube.com/watch?v=ljicApW23Aw
http://www.youtube.com/watch?v=mwGKfoflZCQ
http://www.youtube.com/watch?v=Cbea3VmYDkM
http://www.youtube.com/watch?v=urHFGXeWg78
http://www.youtube.com/watch?v=uxYgLc68XJ8
http://www.youtube.com/watch?v=LxakSFxW4-8