It looks like there are several interesting, new "music servers" with an integrated CD reader/computer/disk storage (Zero One, Mcintosh, Cambridge) but I have the same concern - there are a lot of parts that can fail in these systems. Computers are not reliable in general and I would rather not have the risk of placing all these components in one box. Ideally, you would have a PC to read the data from disk, an external hard drive or network attached storage, a DAC, and possibly a device to take the data from the PC to the DAC. I like the system of separate components that Steve at Empirical Audio has developed which includes an off-ramp to covert the PC USB output to input to the DAC. Steve had a demo of his system at the Rocky Mountain Audio Fest and I was very impressed. He is currently developing a version that uses I2S instead of SPDIF for the data transfer between the off-ramp and DAC.
Is there a good argument for integrating all of these components into a single box? And any suggestions for other systems for PC audio that I should consider?