I highly recommend the Hercules Game Theater XP. It's $97 shipped at Newegg for the OEM version, which happens to include exactly the same things as the Retail version, except for the pointless second cd. The cd you get with the OEM version is the same as the Retail version that includes drivers (though not for Win2k or WinXP), and various programs and equalizers.
The real benefit to this soundcard is that you can hook up a ton of stuff to it. In addition to mini plugs to connect various computer speakers, you can hook up 6 individual speakers through the larger plugs. The biggest benefit in my opinion is the 4 port USB hub built in. Upgrade your sound and add more USB ports--kill two birds with one stone!
Most importantly, it sounds great and looks really good. I have this mated to Klipsch Promedia 4.1's and all of my friends can't believe the quality of my sound system. I could not be more satisfied with the Game Theater XP. Cheaper than the Soundblaster offering and with a superior chip inside (same one as the Turtle Beach Santa Cruz if I'm not mistaken). Do it and you won't be dissappointed.
~tdawg
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Enermax 431w PS
MSI K7T266 PRO2 (VIA KT266A)
AMD Athlon XP 1600+
256MB Crucial PC2100 DDR
Pioneer Slot-load DVD
Mitsumi 24x12x40 CDRW
Visiontek GF3 Ti200
Hercules Game Theater XP
Klipsch Promedia 4.1