thanks for the link.
i am surely keeping the HD570 for as long as it lasts, while i am never really into audio stuff that deeply & $$, knowing wads good currently cant be a bad thing. rather than paying for a unit thats obsolete & maybe overpriced (by some stores...).
i prefer off shelf items with less "upgrade" path, too complicated. for music, i try not to get too distracted by all the gadgets. same goes for photography, less is more.