Hello, I'm new to this forum, and website, and I tried to find the answers for my questions all over the web but couldn't, or at least not completely, or with the most easy answers (English nor Computer languanges are my main). I'm thinking of buying a Macbook Pro 15", but I'm divided between which one is the better (in my price range) and (in language for dummies) the main differences between them. Thing is I previously owned a Macbook 13" but it was stolen about two weeks ago and I need to replace it. Fast. And this time I'm going pro. So I'm divided between the Macbook Pro 15" Core i7 2.66GHZ 500GB hard drive 4GB memory and the 15" 2.2GHZ (possibly the 2.3) 750GB hard drive 4GB memory. Thing is, the 2.66GHz i7 is in my research about 400$ cheaper, and that is a lot of money for me. What I would need to know is if its worth it. What is the difference between a Core and a Quad-Core? Because the cheaper is Core but has 2.66GHz and the most expensive is only 2.2GHz. Well can anyone explain me, the dummie I am I mean, with which should I go with please? Thank you so much in advance.