I am a casual user and just looking for a good computer that is going to last me a while. After reading on here I have decided that I do not need 16 GB RAM lol I am basically deciding whether I should get the 13 Inch Rmbp and upgrade to the dual core I7 or whether I should get the 15 inch Rmbp. From my understanding even the entry level is better? Because Quad Core makes a significant difference? Like I said I am a casual user and far far from a expert.