Thanks for the replies. I'm only concerned with the sound card right now. I don't want to spend the $250 or so that a set of Z-5500's or Z-5300's would cost. I'm sticking with my X-530's, for better or worse. The reason I got these in the first place was that 1) they were too cheap, er, inexpensive, to pass up. Also, the volume on my Creative Inspire 4400's was fubared (random fluctuations), so, I decided it was time to move on up to 5.1. I don't usually use the software that came with the SB Live 5.1 OEM, except for the occasional speaker test as needed for troubleshooting. But I like having it there if I need it later.
My best friend has a fairly recent M-Audio card (I'm unsure of which one, exactly) and loves it. But, I've been leaning toward the Audigy 2 ZS. I guess it's just my familiarity with the brand name. I just wanted to confirm that it would make some difference-apparently a pretty significant one-in sound quality. I've checked EBay, among other places, and, as expected, OEM (bare) cards are at least half off the retail price for the Audigy 2 ZS. Are there any dangers or issues I should be aware of when considering an OEM card, aside from the very limited documentation/support? For example, would a Gateway OEM Audigy2 ZS work in a Dell? I assume it would. But, I've been wrong before. Thanks again for the help!
Jon