An option for a source of music is using an Apple TV as a music server.
You can rip your CDs in lossless to the ATV. The ATV has a digital output via Toslink which can be fed to an external D/A converter then to your amplification.
A news letter from PS Audio outlines the process. Scroll down the page at this site.
PS Audio - July 2008 : Fresh & Informative Stories of High-end Audio, Video & Music
If the 160 GB ATV is not big enough there is an aftermarket source that will install a 250 GB drive. I have all my CDs synced to an ATV, (the CDs themselves stay in storage) and use an iPod touch with the Remote app to select what I want to listen to.
I think the sound quality is pretty good through an FM Acoustics amp and an older Goldmund pre-amp.
PS. If you don't want to spend the money on an ATV the Apple Airport Express, the small router, can receive your iTunes transmissions from your computer via the Airtunes feature, then into your amplification. What is not widely realised is that you can take the signal from the Airport Express in digital form to an external D/A converter, you need the optical connection cable. The D/A converter in the Airport Express is pretty minimal so an external can be a real benefit to sound quality