Well, I looked up your Creative unit, and I gotta say, I remember when that company was top notch for desktop computer sound cards, before when built in audio really sucked bigtime. I gotta be honest, I really don't trust a company who doesn't state the specs of their device in detail, such as how many amps the amp puts out. They can state their unit as being audiophile grade all they want, but in my experience audiophile gear states the amps, your unit does not, so I don't believe them.
In my personal experience, using my V-Moda LP2's for at least half a year now, they are 32-OHM can's, so a little harder to drive then your standard 16-OHM can. And I tried the Fiio A5 amp with them which put out about 1-watt for any real use. My can's did sound good for sure, but I still felt like they were possibly lacking, in other words, if I could get more power into them, they might wake up some more. Thats when I got the S.M.S.L SP200 amp, and these cans really woke up once I got 3-watts into them in high gain.
Additionally, I eventually got around to getting the S.M.S.L M200 DAC which improved the sound even further with a high end DAC. If you go on S.M.S.L's website, you will see they clearly list the specs for everything that they make, and in their AMP and DAC section, its not exception. Creative could learn a lot from S.M.S.L and other audiophile component companies. It was clear when I was looking at their website, their selling points were 7.1 audio support and 120DB. Ya well, all that is meaningless when it comes to rating quality sound.
A horn speaker could push 120DB and pop your ear drums like a balloon. But it could also do so, sounding like complete crap. DB doesn't matter. Amps, Watts and THD is what matters more. How clean the noise floor is as well, which THX amps do very well with low noise floor. If your really asking us all for recommendation on what you should do with your setup. In my personal opinion, you should ditch that device, and graduate to a S.M.S.L SP200 AMP and M200 DAC.