Mini's aren't bad little machines. I would love to have a PowerMac, MacPro, whatever they call it now, but not dropping that much coin on a machine. A Mini with a nice NAS ($150) and you can have a nice little setup.
EDIT: Uncle Sani will hate this post.
I also like the Mac OS a lot better than Windows, it's a Darwin based kernel, but then again, I used to be a UNIX admin and I hate Microsoft with the burning fury of a thousand suns.