Ok I have limited knowledge on good sound cards and headsets but for your information I wouldn't suggest buying a sound card if you are getting a USB headset. A sound card is used when a headset with jackpins is plugged into the deicated audio ports on the sound card. The information will then be converted by the sound card whereas USB would you the onboard audio converter. Hope this helps.
This may help:https://m.youtube.com/watch?v=jUgHIVtwA5A