well i went on the alienware website and tried to make the ultimate computer setup. So ive worked out that my dream computer would cost about AU$10,000.
I have personaly built $15k (15,000) desktops for video professionals before. Guy wanted 4 of them, so it ended up being about $60k for the four work stations.
I am sorry I didnt make this clear, I was talking about normal computers built for a single person, not super computers.
But for all persons interested in super computers you should go to the website http://www.top500.org/ they have info about supercomputers, and have a list and specs of the BEST 500 supercomputers running in the world.