Nightshift... I noticed a question about Mac. So, here comes a Mac user to fill you in.
Mac OS X is UNIX, and can do all the cool stuff Linux can. You can install XFree86, run KDE, GNOME, the Gimp, et cetera. Mac OS X comes with all the dev tools in the retail boxed set. It includes a terminal with full, unrestricted access to the underlying UNIX.
Mac OS X also has a beautiful UI, more advanced than anything MS, or even any of the Linux desktops offer (even though they're improving day by day). Mac OS X has major app support from Adobe, Corel, Mic>COUGH<ro>HACK<soft, Alias/Wavefront, et al.
You get the good points of Linux, Mac OS/NeXTStep, and Apple hardware. And if you get a new one now, you can still run Mac OS 9, which really does still kick a lot of ass. Oh, yeah, you can run Linux, too!