I'm running short on space for my macbook and I'm going to be picking up a new portable drive for working (not backup) usage. I've got a 1TB drive for backup. I'd like to be able to put my Aperture Library directly on the drive and run from there. I'm just wondering if the interface will be fast enough for this? I have zero experience with firewire but I'll probably go with something with FW800 to help with the transfer rates. I'm trying to stay under 100-120 bucks so I'll probably go with a 500GB drive.. I guess if it isn't fast enough I'll break up the library into smaller chunks and put the older stuff on the external drive..