I did notice that the M Audio USB has only two channels. I would really like the M Audio Firewire but again, the mobo doesn't have that option. I would be needing the line input so that leaves out a USB DAC. I'm at a bit of a loss as to which external audio solution would work best for me. The list you have though is helping put things together a bit better for me.
Having good audio was something I left out when planning this project. But all the talk about audio from the audiophiles on this forum is infectious, and now I am needing something a bit higher level then a "consumer" solution.