I'm initially tempted to say that I would switch to OS X.
The problem with that is that you can only run it on Apples, which wouldn't be a problem if they weren't little pieces of, um, never mind. Basically, Apple has a top of the line OS, and they've tied it to cruddy a cruddy CPU company, Motorola. Of course, there is always the price issue, why would I pay close to $2k for an apple, when I can buy an IBM compatable with the goods for around $600 (or less).
So, I suppose I would choose Linux instead.... Yes, yes, I know OS X IS Linux, but it's not a version that can run on mainstream computers. If Apple ported OS X to IBM compatible computers you can bet your sweet ass I'd buy it in a skinny second.