I had ordered a dual 2.0, but I just changed it to the 1.8. Speedwise, the dual would be faster, I am sure of that. However, for every day tasks such as word, email, surfing the web, etc... Will there be much of a difference? I figured the biggest difference would be in the final cut, imovie, etc... Since I only use those apps 15% of the time, I figured I was better off saving the 600. Did I mess up or was this a good move?