a friend of mine is getting into video (ie. short films, etc.).. i'd convinced him to go with a powermac G5 vs. a PC, but now he's decided a laptop would be more convenient for editing on site when filming in different cities. i'm not familiar with how well vid apps (FinalCut, Avid) run on a power book.. any thoughts/opinions?? there's the obvious advantage of portability, but besides processor speed, what are the disadvantages of the powerbook vs. powermac G5 as it applies to video editing? i'm thinking i'd recommend the 15" w/ superdrive model.. also.. do powerbooks use the same 'physically' sized RAM as desktops?