I guess this would really be a question of which processor will be sufficient. I will be entering college this fall as an engineering major and I know I wanted to wait for the refresh to get my mac for college. I know that most engineering programs are on windows but I have been using a mac throughout high school ever since my family switched over and I can't go back to that crappy windows OS. I figure that personal use can be done on Mac OS X and then I can partition Windows 7 on my mac as well so I can do my school work also. So basically, I will be using my mac partition for web surfing, word documents/powerpoint/excel, light video editing, light music production (garageband), basic mac app store apps, skype/facetime, and iTunes. Then I would be using my Windows partition for CAD software and other engineering and programming applications. The low end 13" has a 2.3 GHz i5 and the high end 13" has a 2.7 GHz i7. I honestly don't know the difference between the two... all I know is both are significantly faster than the previous Core 2 duos. I'm not going to ask which is better for what I am going to be using my computer for, because the obvious answer would be the higher end every time. But my question is is the 2.3 GHz i5 processor sufficient for what I want to use my computer for in college. I don' really want to put 300 more dollars into the computer. Thanks for the help!