My understanding is that Airport Express is in fact the ONLY way to get bit perfect output from iTunes on a PC (Macs allow bit perfect output via other ways). I've read posts where people have tested it and confirmed it's bit perfect.
I use a (Red Wine Audio) modified M-Audio transit as a source from iTunes with the "remote volume disabled" and it sounds fantastic. Not sure what it does or does not bypass, but I hear the computer's other beeps and such through my headphones, which I actually don't mind because I'm using my computer while listening (for me, it's a nice feature).
I use a (Red Wine Audio) modified M-Audio transit as a source from iTunes with the "remote volume disabled" and it sounds fantastic. Not sure what it does or does not bypass, but I hear the computer's other beeps and such through my headphones, which I actually don't mind because I'm using my computer while listening (for me, it's a nice feature).