I've got the pc360 and Realtek® ALC892 8-Channel. It works just fine.
I previously had creative X-Fi Fatal1ty soundcard but it broke, and afterwards I haven't really noticed a huge difference in soundquality etc when comparing it to the motherboard soundcard. Oh, and I'm no audiophile so take it with a grain of salt. :P
That being said, due to practically all the reviews claiming that one needs to have an amp for these headphones I yesterday ordered Asus Xonar Essence STX just to ensure I get everything out of these headphones. Figured that while it does cost a lot it's a card that will maintain its value over time and will be worth keeping even after upgrading my computer.
Will reply back when I get the card to tell if it makes any noticeable difference.