A buddy of mine is a 3d artist like myself, and we actually have worked together different times with different studios. A one time Mac-hater now is pretty much bent on getting a G5 when the 3ghz come out in August. His home built AMD PC is constantly crashing and reporting errors, etc due to frequent internet use (ie, viruses) and lack of taking care of his HD.
Now of course, Macs need TLC to keep them from freaking out as well, but probably about 90% less than the windows world. He's seen me use Apple (and PC's, I admit) for years, and notices how I rarely run into any hardware or system software problems.