I'm currently using some Roccat Kave XTD 5.1 head phones with a Soundblaster Z. Now I've been considering ditching the 5.1 headphones in favour of some better quality stereo headphones for a while now. Would the Sennheiser PC37x be a good upgrade or would I be dissapointed with the lack of 5.1 sound. I've only ever used 5.1 speaker systems and 5.1 headphones in the past. As far as I can tell the PC37x is basically the same as the Game One headphones but all black. They'd be used with my Soundblaster Z. Any input would be appreciated.