How does firewire cable affect quality?

I am a new Mac user and new to video editing. I just recently purchased a MacBook and plan to begin editing my many many hours of miniDV video.
To transfer the video from my camera to the Macbook, I pruchased an inexpensive cable (around $5) from a bargain internet site. I have seen cables for as much as $40 at the local Circuit City.
How important is the firewire cable to maintain the quality of the video? Before I begin importing my video onto my new 500GB external drive I want to make sure I am retaining the quality.
Thanks!
MacBook Mac OS X (10.4.9)

Thanks Klaus1 and Matt!
I successfully imported one tape onto my Macbook. Everything seems to work fine with the cable. I can control the camcorder from the Mac and the video looks good.
I really like how iMovie breaks the tape into several clips. I thought I was going to get one large file that I would have to parse myself!
MacBook Mac OS X (10.4.9)

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Does anyone know how the firewire cable transmits data? I have not been able to find a detailed explanation.
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