Chris-
My personal favorite of Steve Roach is "on this planet", it's a live album, but you'd never really know it, the sonics are fantastic as they are on all his albums. I also really like the collaboration album he did called "halycon days"
Steve Reich is certainly worth checking out, don't think it's ambient music though, it would fall into the modern classical category as would Terry Riley
My personal favorite of Steve Roach is "on this planet", it's a live album, but you'd never really know it, the sonics are fantastic as they are on all his albums. I also really like the collaboration album he did called "halycon days"
Steve Reich is certainly worth checking out, don't think it's ambient music though, it would fall into the modern classical category as would Terry Riley