I have done some DV editing on my aging ibook G4 and will be looking to upgrade in the next 6 months or so. Also I want to upgrade my video rig to HD and will probably choose an HDV format camera. My options for the Mac are either a 20" iMac or a macbook with a 20" or 24" display. I would be editing on an external drive in both cases. Can the current round of macbooks handle this work?