Of the Steve Roach material I have heard so far, my favorite is Body Electric. It is, as the title suggests, body moving music. It can create such a deep trance that you might think you are on drugs while perfectly sober.
Second and third runners-up are Trance Spirits and On This Planet.
I don't care for the super-quiet ambient stuff like Streams and Currents (imagine a more technically advanced version of Eno's Music for Airports, and you will get the general idea.)