Hold your horses! You don’t need Firewire for analog capture, unless you use an A2D converter such as the Canopus ADVC series, which captures analog signal though S-Video or Cinch and delivers it to the PC using a Firewire port. Otherwise, what you need is a capture card with S-Video and Composite inputs. For $ 100 you could get the Pinnacle Studio AV/DV or something similar, or take a look on eBay.
So find a device that fits your needs, and budget, and post back for more advice.
