Just because i won't be buying any amp in the near future, i think i'll stick with the 598's. Thank you for your input!

I have one more question: what do you think of AKG K-612 Pro? I found them here like 25 euro cheaper than hd598. 

  Thank you so much for your fast reply!    I live in Romania, and here the price of 558 is 174 euro, and for 598 it is 208 euro. Would you say the 598 is worth the difference?

Hello everybody, I'm thinking about buying Senn HD558 or even HD598 as my first hi-fi headphones. Do they still have that cracking problem or it has been fixed? Also, on my PC i use Yamaha RX-V377 as a receiver for my 5+1 speakers, is this receiver good enough for these headphones or do i need...