how much better is the mbp with the two graphics chips. dont want to spend tons of cash on my new notebook, but will pay for the two chips if they really make the notebook that much better. i do my gaming on an xbox 360, the only great MS product. the big intensive projects i do on my notebook is processing hd video, not too much, but from time to time. family videos mainly. i have no desktop, just notebooks, so whichever i have is the most powerful computer i have. i do not edit a lot of video, and i do spend a fair amount of time in photoshop essentials, doing basic editing. right now my video editing is with ivideo if this matters. what are the thoughts of the population on getting a macbook pro with the two chips versus just one. is it possible to open the notebook and add the 9600 at a later date myself, or by one of my whiz computer friends ? thanks for help.