Sound cards are awesome. I love mine and it made a considerable impact on my setup --> http://www.nrnl.org/post129.html#p129 . Whether one needs it or not is not up for debate, what sound card to get is and I say ASUS Xonar Essence ST/X. Personally got the ASUS Xonar Essence STX Soundcard recently and couldn't be more happier with it. I, too was fed up with Creative's less than stellar performance and driver reliability ever since I gave up my old SB Live! Value lol. I can't fault my card, and has been an excellent addition to my audio setup, but don't take my word for it -
Here if ya can be bothered please read some of the following reviews or opinions from many a respected source audio and computer industry wise -->
http://forums.overclockers.com.au/showthread.php?t=766494
http://www.guru3d.com/article/asus-xonar-essence-stx-review/
http://www.overclockersclub.com/reviews/asus_xonar_essence_stx/
http://www.extremetech.com/article2/0,2845,2339333,00.asp
http://www.xbitlabs.com/articles/multimedia/display/asus-xonar-essence-stx.html
http://www.overclock3d.net/reviews/audio/asus_xonar_essence_stx_-_pci-e_audiophile_soundcard/8
http://www.maximumpc.com/article/reviews/asus_xonar_essence_stx
http://www.stereophile.com/computeraudio/asus_xonar_essence_ststx_soundcards/
http://www.avforums.com/forums/soun...52206-asus-xonar-essence-stx-impressions.html
Apparently for my purpose (Playback using 2-Channel Audio + Analog out to my new high quality amp and speakers) it hands down beats the like of the Creative cards, themselves and the high end Creative cards by Auzentech, the M-Audio Audiophile 192 Card, ESI Juli@, any onboard by absolute miles, and at least on par if not better than some High-End music production cards from the likes of RME and LYNX.
Also passes through surround sound through SP/DIF and TOSLINK connection in case you were wondering.
I also do prefer Dolby Digital for my games over EAX, is subjective as once again most things are with sound. If you the read numerous reviews of the STX given, then you would see that the STX is *almost* on par for games, and superior for music and movies. I do music production and listen to a massive variety of music, and as stated for my uses it suites me perfectly

I have "bit-perfection" working perfectly too, and don't see how anyone else shouldn't either. For a description of bit-perfect and bit-accurate playback refer to this article --> http://www.nrnl.org/post115.html#p115
A few more tid bits of information; A list of games using OpenAL and aLchemy:
aLchemy Games -
http://connect.creativelabs.com/alchemy/Lists/Games/AllItems.aspx
OpenAL Games -
http://connect.creativelabs.com/openal/OpenAL Wiki/Games.aspx
Also Unreal Engine 3 is able to use OpenAL, DirectSound3D or FMOD.