Regarding the whole PS1000 vs HD800 debate, to quote Sean Connery in the Highlander, "There can be Only One". Further, to quote Sean Connery in the Untouchables, "If you open the ball on these [headphones] you better be prepared to go all the way".
I doubt many people will really like both headphones. They are pretty different in their presentation. Further, the PS1000 is absolutely brututally revealing to the point where I am now looking at $500 power cords (and they work!) to turn all that treble into little microdetails that tickle the ears, not gouge them out. Garbage in, garbage out.
They are both good headphones but I think the PS1000 has more super-high end potential. The question is whether there are source components and material good enough for them?