Thanks for all. I now have a suggestion for a s/h in good condition creative ZVM 30gb. How is it compare to all above?

I am looking for a new player and have narrowed it down to the Zune, Ipod classic, or Cowon D2. I will be listening to everything from classical to hard rock with sennheizer hd-580 precision.(i have also vincent headphones amp.) The most important thing is sound quality. I need something that...

hi, Have a sennheiser hd580,is the vincent will be a good match for it? or something else? budget 500$ for a new one. CHEERS.