I wonder if anyone else has this dilemma.
I like Macs, especially after OS X, and definitely due to the fact that I can dual-boot a Windows OS for games, and MacOS.
MacOS has so little latency (assuming you are not running a ton of apps in the background) that you can do decent audio/video work on even a slow machine.
Although NeXTStep (which is what MacOS evolved from) isn't as secure as a true BSD (Open/Free/Net), its nowhere as near a big, fat, juicy target as a Windows machine. So, with basic security measures (HARDWARE firewall between machines and the Internet, running as a user rather than root, etc.) one can keep a secure box with very little effort. Its also a lot harder to hide from the ps command than it is to hide from the Task Manager.
Now the hangups:
Macs are underpowered when it comes to graphics unless one shells out the premium dollars (2-6k) for a Mac Pro. For example, even the highest end iMac only comes with a nVidia 7600 chipset (which is about a $80 to $150 dollar PCI-E card.)
I just can't justify paying $3k for a machine that will end up being a server or given to a relative in 2-3 years, when I can build a generic PC for a lot less. Especially right now, being a college student.
Maybe the answer is another Power Computing -- Apple licensing MacOS to a third party to make 100% legit Mac clones.