Get the STX. Can't comment on Auzentech but have been using Creative cards including 2 X-fi's in the past. Noticed immediately a major improvement in sound quality with the STX. Simply put the sound sounds crisper, richer, and adds a whole new level of immersion in various multimedia. The campaign in Call of Duty 4 sounds insane! I've got Swans M10 speakers and they're finally reaching their potential.

Added to this the installation is no fuss no muss. No bullsh-t software, driver updates actually work, software has a very small profile; it really is a night and day comparison here. Also speaking for myself I always thought EAX was a little bit of a gimick and doesn't really add a whole bunch to the overall audio experience-but that's just me.

But to be fair this is Auzentech not Creative here. And from what I understand Auzentech really brings the X-fi chip to its full potential with cleaned up software and drivers among other things.

But if anything if price isn't a concern you could simply get the STX just based on the physical appearance of the card... It's a very classy and sophisticated looking piece of hardware.

Anyway this is my first ASUS card and I don't plan on going back to Creative any time soon.