Ah, but the nForce APU is a very nice DSP. To compare standard onboard sound (via only a codec) to the nForce APU is an apples to oranges comparison. While the Audigy2 likely uses better DACs (digital-analog converters) than most nForce APU equiped motherboards, bypassing the DACs via digital output eliminates that concern.
I connected a K7N2G Delta-ILSR to my friends digital system, and it sounded impressive, even compared to his Audigy2 ZS.
<font color=blue>Only a place as big as the internet could be home to a hero as big as Crashman!</font color=blue>
<font color=red>Only a place as big as the internet could be home to an ego as large as Crashman's!</font color=red>