http://www.amazon.co.uk/Corsair-CA-9011124-EU-Vengeance...
if you want a wireless one:
http://www.amazon.com/Corsair-Vengeance-Wireless-Gaming...
i have the wireless one, and i definitely recommend it
i'd say get the corsair vengeance 2100 wireless gaming headset.
it has great sound, virtual 7.1 (you can turn this off in the software if you want to) and about 8 hour battery life.
i have one myself and i'm really happy with it.
http://driverscollection.com/?H=ALC892&By=RealTek
here are the drivers, that should fix your problem, your sound card has 7.1 support, so as soon as you install them (you should probably take the second one) you should be good.
hope that helped
have you tried just using it with USB?
using it with just USB and making your standard audio output device Razer Kraken (USB speakers) should fix this.
if not, try configuring it to 7.1 in the audio properties