Well, I've been a Mac guy for about 5 years.  As a web developer, Mac offers me a much more robust set of tools than PC/Windows setup.  You could argue that a PC/Linux machine offers the same, but with Linux you're stuck being a sys admin just to get the basics working.  With Mac, everything just plain works, looks great, and has all the development power of a Unix platform.  For me it's the best of all worlds, but yea, it's pricey  :(