I really LOVE my sound card. Not very many people like creative made cards, although their X-Fi chip is very good for gaming. My card, the Auzentech Forte, is a better quality, better built card that utilizes the X-Fi chip! That, and the drivers aren't filled with useless extras.
Add all of the above to the fact that this card offers you a Headphone pre-amp, and I was sold! Dedicated amp on the sound card, pretty cool!
I also use the HD555 with this sound card, and have never regretted spending the money on this audio setup. Other people will tell you that they would prefer a dedicated amp after the sound card, but for my needs this is perfect.