I agree that you can easily run HDMI output, but a sound card does have benefits.
The X-Fi Titanium is a decent card, good for the price. If you want something very good either an AuzenTech HD HomeTheater or an ASUS Xonar D2X are good choices. If you have a high end receiver, you'll want a card with DTS/DD encoding so that the receiver can do the decoding. On a mediocre receiver (or non) then the minimum would do. In that case an XFi Titanium or Xonar D2X are good. AuzenTech Bravura is a step up from there, and then the Forte is a bit better.
well wat others options are there really??
ye we all pretty much agree on SC encoding and the receiver decoding