p1fel,
Back in those days it used to be a tougher decision because Apple were using the IBM PowerPC processors.
However now they are using Intel processors, it means Windows virtualisation can be done more than adequately using VMWare or Parallels in conjunction with a Windows license.
This means that unless you are doing heavy gaming, graphics rendering or other significant work that would require you to use a hardware PC, you can always have a copy of Windows readily available at hand to maintain computability with applications that don't run on OS X (or the odd Internet Exploder only website).
N.B. I said above access to a hardware PC, but you can also use Apple Bootcamp to the same effect.... a quick reboot turns your mac into the same thing as a hardware PC, absolutely no difference. However for most people, the virtualisation route is a better one as it means you can run both systems at the same time (and drag files back and forth).