I ordered the Panasonic SA-XR25 receiver - the model with digital amps and digital signal path that's been getting pretty good raves recently.
I'm going to try using my iBook out to an M-Audio Sonica USB card that has a digital output. Theoretically, I should be able to pass WAV files directly to the Panny's digital inputs and end up with pretty good sound. The iBook connects to my network via 802.11b, and it can connect to stored music files on my Win2k3 server. I picked up the Sonica new on *bay for $40 shipped, so it's a budget friendly idea so far.
Also, when I'm at work, the Sonica should be a much better DAC than what's built into the iBook. I run it into the aux input of my Kloss table radio, which already sounds pretty good.
Whaddya think?