I have enough money to buy an HD 800 if I would so wish, I also listened to the HD 700 for a small while today but I'm not going to invest thousands in audio equipment to get the best sound available.
I'm getting the HD 558 (normal price 150€) for 130€, the HD 598 costs 185€, a 55€ difference which I'm not sure if I should use the money for something else instead.
I believe the HD 558's are good headphones to use for anything, I can go and compare them to a bunch of grados (SR-80/60 & a custom SR-80) and the HD 700 at "the" local audio store which also has a DT990 to listen to.
I think my next audio purchase will be some good 2.1 speaker system like the Logitech Z623. (After I bother to clear some desk space for them!)
The headphones will be mostly used for night long strategy gaming and delicate music like solo piano and classical.
"With a subwoofer this size, the Z623 excels at bass-heavy content such as video games and action movies."
Maybe my next headphones will be a more considerable investment and a much more informed choice, but only after my experiences with the HD 558 and the rest.
Edited by Cthoeprrrey - 1/8/13 at 3:15pm