i am taking the leap and buying a MacBook. I have an iMac, but now want a portable Mac other than the iPad. I am trying decide between two. One is a 13 inch 4GB for $750 (5th gen). The other is a 13 inch 8GB newest model for $999. Is it worth spending another $250 for the newer model with more RAM? I am mainly using it for Internet browsing, streaming Netflix or MLB, iPhoto, etc. Thank you for your advice!