I've been using an X-Fi Xtreme Gamer for a while now and am about to order a new PC so will need a new sound card to go with it. I do play games quite a bit but also like my DVDs to sound good as well, for me the X-Fi seems to have great sound from my experience but if the Xonar is a lot better I'll happily pay the difference. If it helps I'm using some Sennheiser PC161s.