Hello. I am going to be buying my Mac Pro at the end of this month. I need some help on what to invest some money in. I will be editing AVCHD as well as HDV in final cut pro. Should I go for a 1TB internal drive to be my scratch disk, or should I get a 1TB firewire 800 external drive? Which one would be faster when editing AVCHD and/or HDV? Thank you for your help!