You can find a windows that is better as far as processor video card and ram go. For much cheaper, and if you know how to edit on a PC ala vegas or Premiere Pro then you can have a very legit ass setup.
The only reason I use a mac is to run final cut, and I know nothing about PC editing as far as codecs and using premiere pro.
Sometimes I wish that I knew how to use Premiere because owning a mac is far overrated apple as a company blows. (personally opinion) They make very pretty machines but the price premium sometimes just kills me.
As a mac User I am highly considering switching and learning Premiere Pro. Every other piece of software I use operates on a Windows except Final Cut.