I have been wanting to get an HD for scratch disks and to edit directly onto the external HD in Final Cut. Due to my lack of experience with external HD'S, I went ahead and bought a 1TB USB 3.0 Western Digital passport drive.. but I just found out about Firewire 800 that is seemingly faster and better for constant transfer (which I believe video editing falls under). I'm just wondering how significant the difference is? Afaik, right now the biggest Firewire 800 drive available (that runs power off source and not outlet) is the Western Digital 640GB, and it costs around $40 more than the 1TB USB 3.0 passport. Is it worth the upgrade if size/cost isn't an issue? I could always get a bigger USB3.0 drive for storage, and then use the FW800 drive for editing, but don't really want to make the plunge unless the speeds are considerably faster/noticeable. Any insight would be lovely. Thanks!