Laughable Gaming Audio?, The Asus cards are better for Gaming i work at www.overclockers.co.uk We test all our cards on the forum before we sell them and we as well as all the other reviewers say the Asus Xonar Phoebus is the best gaming card, They did have problems with Drivers and the Price on launch but the card is far better then the Titanium HD, Also the OP is looking for Cards with a Built in Amp for the headphones and the STX and Pheobus are the only Audiophile level Sound cards for us who are so picky. Although unless you're using topend Headphones you won't tell the difference anyway because Both have such low Distortion.
I'm not asking you to Agree with me that's just my Opinion and everyone Else's at OCUK and alot of the reviewers.
Let's see then. Lack of EAX support from version 3 onwards (yes, I'm aware of current usage), lack of hardware OpenAL, lack of positional cue improvement algorithms, those are enough to differentiate Asus cards from Creative cards.
Where exactly is the OP looking for a card with an integrated headphone amp? Also, the Creative Sound Blaster ZxR has audiophile-grade components and comes with a headphone amp for headphones up to 600 Ohm, so do look into that card as well.
The main point is full gaming support, something X-Fi based Creative cards have, Creative Z series have partial gaming audio support and Asus cards have even less gaming audio support. Those are just facts.