I have the HD800, the PS1000 and the T1. Each is great in some area.
The HD800 is really fast and has a luxurious soundstage. Imaging and placement are terrific. The HD800 is amazingly revealing, so much so that I not only hear off-mic coughs and comments but even stuff I'd never have thought about. My craziest revelation was Jimi Hendrix snorking some snot, off-mic, on Foxy Lady. I always thought the cough came from the drag off that cigarette but the HD800 reveals otherwise.
The PS1000, with its HF extension and filter-free Grado sound, lacks the sense of soundstage I get from the HD800, though it also feels like there's nothing between me and the music. It costs $,1700.
The T1 is a neutral can, like the HD800, with a warmer sound signature and a smaller soundstage. It has a very sweet presentation, though the mids are not as lush as ton he HD800. It costs $1,300.
I don't have a favorite headphone but I love the HD800 - WHICH I PUMP THROUGH MY M^3 WITH STEPS. The M^3 has plenty of power but mine has a variable bass boost. If I get a track which seems overly cold or lacking in thump, I just dial up the bass. The sound is so good, there are tracks on which you'll practically crap your pants.
Bring extra underwear.