I would get an Apple iBook and a USB DAC. The Wavelength Audio Brick is a good choice, but there are many more available. I agree that without a screen (and a big, big hard drive) a hard-drive based system is limited in capabilities. You could also simply get an iPod; simple, small and decent sound quality with Apple Lossless files. Use that with your stereo and use your computer to rip CDs and load the iPod.
