You forgot the "storm" version. Though it's just extra sound effects. I chose Echoes, just because that's the version that I was introduced to first. I bought the album later. It was only until after I traded for a DTS disc of the Quad version that I heard parts 9 and 10, and I must say, part 9 is pretty cool. Seems like Floyd's gotta have a jam somewhere on every album! I also think that while the PULSE version is nice, Dave's voice isn't.