I may break down and get a current model of the 15" PB G4. I am just wondering what the differance is between the 867MHz and 1GHz. Will that extra speed for the extra few hundred make a differance? I will be using it for writing, internet, games, some pohotoshop, and maybe a little burning of DVD and video editing but not sure on that. So will that extra speed help with photoshop and games?