IT has USB on the adaptor as well as standard audio jacks and an input for the mic so it should be compatible with most sound cards
http://www.ebuyer.com/product/126185
xi-fi xtreme gamer should be a fantastic bit of kit within your prices range...
However if you want to get the best out of your headphones I would probably suggest investing a bit more and getting a Razer Barracuda AC-1, it has the HD-DAI connected that your headphones are designed for but its about £130,
http://www.scan.co.uk/Products/Produ...oductID=519889
If you want to spend the extra its probably worth it but otherwise the Sound blaster Xtreme will be more than capable of the job