(snip)hey cost more money, and PCs can read digital music exactly the same
I suppose if you want to deal with an inferior operating system, vastly increased vulnerabiltiy to viruses (if you use the same computer to surf the Net), general instability, chop-shop reliability (should you choose that direction to save money), and worst of all the likes of Microsoft software, well then yes; you'd save a bit of coin with a PC. They certainly are capable of streaming music just as good as a Mac, and indeed do cost less money in general, though I find that, as in most things in life, you get just what you pay for. Fast PC's tend to cost just as much as fast Macs. Cheap computers indeed have limited capabilities, and streaming music does not take any sophisticated for ultra-fast processor, nor an abundance of RAM. The Mac-Mini is a great suggestion by Rsbeck. At $599 with a free keyboard, all you really need is a small monitor and external drive. For a grand you'll have a dead reliable computer interface that's as easy as pie to use and will be more than useful at other applications, and not take up much room to boot. A used or factory refurbed Mac iBook will set you back about the same but you won't need to spring for the monitor. I work with an old 12 inch G3 iBook which typically go on eBay for around $400. It does everything I need it to, is very portable and streams music effortlessly through iTunes.
Just my highly biased opinion. I find nothing appealing about PC's whatsoever. If I played games on my computer, or I needed it for my dental practice, or other specialized small biz application I may feel differently I suppose.
Marco