Out of these headphones I've heard/owned all but AD2000.
If you're looking for the best can for variety of music genres then I'd go for MS-Pro or RS-1. They do pretty well with everything but the shine with rock/metal music. MS-Pro has slightly sharper, edgier and more analytical sound than RS-1, which is more "musical" and smoother sounding. It's totally up to your preferences which one you prefer.
SA5000 is a great headphone. It works very well with electronica and fast rock or metal music. It has extremely detailed sound and it's also very fast. No problems with double basses or complex passages. I'm not sure what gear aerius used when he auditioned these headphones but I just pretty much can't agree with anything he said except that SA5000 is quite comfortable on your head. High end can be much more fatiguing on MS-Pro than it is with SA5000. I never had problems with sibilance or stuff like that with SA5000.
K601 was nothing special to me. Mids and basses were hidden somewhere. High end was clear and detailed. Very thin sound for my preferences. All in all it was pretty much like K701, except K701 has more balanced sound signature.
I like when there's more body in the sound. My #1 preference is Sennheiser house sound (HD600/HD650) so all the headphones mentioned (except AD2000 which I haven't heard) sound slightly thin and bodiless to me.