Two things that jump immediately to mind on the Mac side of things...
Apple hardware can dual boot both Windows and OS X -- with the Intel machines, you don't even need a VM anymore. Since you can install both natively, there'd be no need to choose if you get the Apple hardware and can get the OS's for both. Poke around on the Mac to learn it, still have Windows for when you need it as well.
The second depends on what kind of IT work you do -- terminal access in the Mac is a full UNIX shell -- sorry can't remember which variant is default, I know most of the major ones are available. So rather than trying to work with the Windows command line (or installing cgywin/msys/etc.), you get a lot more power for shell scripting and the like, without being constrained by the limitations of Windows batch files.
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