How Much Would This Computer Cost?

I have no idea how much this would cost, and I want to know about how much I have to save up for. Something to achieve.

Requirements:

  • 130-150 Gigs of Space
  • Fast Processor
  • A bunch of RAM
  • Ports for Video camera (not sure but maybe FireWire Card?)
  • Really good sound card and video card

Around how much would that cost? And am I forgetting stuff?