I've been working on this project for a while and have posted some stuff here and gotten some great help.

First I tried to run digital coax from Audigy 2 and ran into problems on digital inputs on my Sony 333ES being full.

Next (and currently) I split the sound off my front speaker output from the Audigy 2 and ran an analog signal to my receiver and simply ran it into an unused input. I immediately ran into hum issues from all the wires I was using. I upgraded the wires to some shielded Monster cable and got rid of about 3/4 of the hum...but there is some still there at higher volumes.

So now I'm looking at getting the digital signal from the computer...through the wall...to the stereo and then changing it to an analog signal which can then be plugged into my stereo. An great (but expensive) example of this is found HERE. But I'm not interested in having this be wireless or having an LED readout at the stereo or a remote associated with it.

I simply want something that will take the signal, run it to my network hub, then to a box at my stereo where the signal will be converted from digital to analog and then output w/ left/right stereo signal which I could then run into the stereo.