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And Eric, another thing that makes me uncomfortable about you using Vegas. If Final Cut's already an industry standard and someone asks you to do something. If you're using Vegas, maybe that one thing isn't easy to figure out how to get done? But, everyone's doing it that way because it's easy to do it that way in Final Cut? How many times could stuff like that happen...

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That is the real issue here. It is not mac versus windows or how many cores or anything else. It is about Final Cut.
Which so happens to be a Mac driven method. If you want to just cut video Adobe premier for windows was the easiest(for me) to pick up. You already have windows and hacked versions of Premier are readily available. If you intend to make cutting video part of your profession. I would suggest doing it the way professionals do.
*Northrop* Excellent raid/sata clarification.