Well, i went out to a shop which i found selling all the headphones ive been looking at. Unfortunately, they didnt actually have the DT880, HD598 or K/Q7xx to try when i went in, though ill go back when they come back into stock.
However, i did try the DT990, HD600 and 650. For starters, they were quite a different experience to anything id tried before, and I actually found the hour I spent listening to them pretty tiring. Maybe that was the lack of amp and high volume levels, or im just not used to them.
I REALLY didn't like the DT990; it had way more bass than im used to, and on the high notes it sort of sounded like it was breaking up.
I loved the 600, they were definitely my favourite of the three; masses of detail and they sounded incredible on my classical guitar music (ive never heard the sound of the artist's fingers sliding along the strings before!), random pop, everything really.
The 650 was pretty similar, but er... wooly sounding? Not sure how better to describe it.
So, are the 598 or the K7xx on similar lines to the hd600? In fact, how is the 600 in DH, particularly in terms of soundstage and positioning?