Not to discourage you, but if you're going to run both music and non-music software in a windows environment, why consider a Mac?
I got to spend some time with a Mac and think I will like it a lot for everyday use, office, web, website maintenance, etc. I also don't like Windows 7 much, and think I will like Windows 8 even less. But I have some old software that I run for my gem and jewelry business that is either long out of print or else not available for Mac. So the ability to run VMWare or Parallels is a big plus for that. Since I will have a Windows XP environment on the new machine anyway, I plan on staying with dbPoweramp, which I like a lot. I use the multi-encoder to rip both to FLAC and to AAC for my wife's iPod at the same time.
I will migrate my Squeezebox server to the Mac OS side. Likewise Lightroom and my gem photo catalog, and website support stuff.
I also like the fact that I can continue using all the Windows versions right away, unless and until can get them migrated to Mac OS.
My wife is also considering a Macbook to replace her old Dell notebook, and it would be simpler if we have one common environment for our home and business stuff that we both use.
Finally, all the new Windows machines are going to come with either Win 7 or Win 8, and while I can back-install XP, if I have a problem, the vendors won't support it. At least with the Mac, I get support for the Mac OS stuff, and VMWare at least still has tons of people running XP images on Macs, so there is support available there too.