[sunnyice]

  Some people think different SD cards will produce different sounds. YYMV. 
 
The HD600 and HD650 used to share the same driver; the 650 was still regarded by (almost) all as an upgrade over its predecessor. I think that the 598 sound much better than the 360. It is also cheaper than the 360; $150 as opposed to $250. 

See my problem is Im from canada and the hd598 are upwards of $250 and the pc360 are around $230 here. Amazon.com doesn't ship sennheiser headphones to canada.

 

[FatmanSize48]

Well, for $20 extra you get a much better headphone--the 598's soundstaging, above all, is light years ahead.