I'm not sure what it is you think a Mac can't do. Mine does everything I can think of. It's designed to be simple enough, but I'm a tinkerer, and love to get down into command-line changes to get it just the way I want it (The operating system, I mean. The hardware is damn near unrepairable by the average person nowadays).
Could you even get a custom made PC? I'm keeping my Macbook until Windows 10 comes out... can't stand Windows 8.
I couldn't agree with you more... I have Windows 8 at work, and I hate it.