What do you use for a sound card?

[Ecodisk]

Other then the standard on board sound.

 

[doucy2]

ide like to know also
are there better options out there then my built in quicksilver audio

 

[bousozoku]

M-Audio sonica when I'm using speakers and whatever is built into my Logitech USB headset.

As a premium choice, I would be using an M-Audio Audiophile card, internal or external, as it seems to be the best of the bunch available for Macs.