Recently I purchased Natural Readers which is quite good, and maybe the voice in the link below is Natural Readers one, just not one I got included in my packages..
Anyways.. the voice used in this documentary is insanely impressive, it's almost perfect..
That artificial voices can be used like this in a documentary is too freaking cool.. actually, not being either enligsh or american, I think I wouldn't notice the voice in this doc to be artificial if just hadnt been working with such..
http://www.thedaybeforedisclosure.com/index.html