I bought an Ibook back in February and due to the wonderful experience with it, I have decided to take the plunge and completely switch! My PC is currently for sale on E-Bay and when it sells (fingers crossed) I am going to get a G4 tower since I cannot afford the G5. I am going to have around $1300-$1400 to spend and am deciding between a new single 1.25 G4 or a used dual processor quicksilver or MDD. On e-bay I may be able to snag a dual 800 or 867. Is there going to be a huge speed difference between say the dual 867 and the single 1.25? I will mainly use it for office work, Macromedia MX suite, the occasional game, listening to music, and would like to get into video editing. Any thoughts?