Next PC I "buy" will most likely be a Mac for home recording studio. Windows just all around sucks for this. Tried setting up a MOTU 828 under win once. The best "lag" it got was about 1.5 seconds for real time recording. But, still debating on doing the Mac thing or upgrading my roland VS1680 to a VS2480.
Next one I "build" could be win, linux, or OS/2 depending on what I'm doing for kicks at the moment. Back when I was doing the network engineering thing, we all had a win box for reports, Visio, etc, and a linux, BSD, SunOS, or Solaris for doing actual network stuff at our desks. Most of us also had self built non windows boxes at home for those oh so wonderful 3am calls of "something broke." Trying to troubleshoot a network problem with any version of windows is like masturbating with a cheese grater.