How important is L3 cache? I do light video editing (but I'm looking to get more serious soon, as I'm a film major)...is it gonna make that huge a difference that I should choose a powerbook or powermac over the iMac? Also, when it comes to video editing, how important is the graphics card? I know that since Quartz Extreme, the graphics card does very little in the way of the GUI...about all I can see it being worth is playing games, after a certain point. I mean, is 64mb of VRAM good enough, or should I buy a powermac JUST so I can upgrade my video card every year?