If you compare a mac and pc with the same hardware (not price point), they’re within about $100 of each other for the base macbook and comprable Dell laptop. With Apple and OSX, you get so much more bang for your buck. After a short learning curve, I found myself actually USING my computer, instead of tolerating it. And I get iphoto, imovie, idvd, garageband, and a more productive environment. I don’t worry about viruses or spam. It’s worth EVERY penny I’ve spent on it, and more to make the switch.
And now on Intel, you can run Windows and OS X in parallel, or even at the same time with Parallels or VMWare. If you’re in design/development, I’ve found the tools on the Mac just plain better than on Windows, either the same software, or their equivalents. I won’t be going back any time soon.