I wouldn't dream of spending this much on something without doing some research and asking for long-term opinion (not just sound-wise). If you look at the OPs profile, you'll see that a purchase of this magnitude is quite a venture for him. Many of us are not as financially capable as others on the forums, we just can't justify spending this much without due consideration. He does have his own opinion on sound between the three, now he just needs some affirmation from long-term owners on whether or not this is a sustainable purchase or not. I understand, diminishing returns, value is subjective, but people are trying to be practical here. He can like the sound of one can for a moment, but many other factors during short auditions can contribute to this impression. The PS1000s are very much a wow headphone, but whether or not he doesn't get tired of the sound is another thing all together.
I'm of the opinion that short-term impressions can be accurate, long-term impressions can help you consider whether you will like this sound or not in the long run.
Edited by TwinQY - 9/30/12 at 3:27pm