Steer clear of any of the new Creative products mate... They're overpriced sh*t.
There has been a great deal of company switching with the HDA cards recently. They started as HDA, switched to BlueGears, and now have once again switched to a new company named Auzentech.
Quite simply put... THE best sound cards on the market at a fraction the cost of other cards by different companies, namely Creative.
Just keep in mind. My first card in my last comp was an X-Fi XtremeMusic and it was t3h ub3r suc|<. The best thing I ever did to that computer was put the X-Fi out of its misery and install my X-Mystique (which was then later upgraded to an X-Plosion). The X-Plosion is going to give you the best of both worlds (music & gaming). The X-Mystique is an awesome card for music if using the analog outputs, but using Dolby Digital Live or equivalent optical outputs gives you great mids and highs but the bass is subpar (too be expected as DDL isn't a music standard). Now the X-Plosion incorporates DTS which is straight up pimpin' in the music department via optical/coaxial. Both cards will also rock your socks off in games, great sound dynamics that really put u in the center of action.
I highly recommend either of the cards, but for only a bit more the X-Plosion is your best bet.
Cheers mate!