I've been doing some reaserch and I am now more undecided than before. I make no use of creative professional applications, I use Office and browse the internet. I used to have the 15" model from 2011 and I loved the screen size for everyday tasks and for watching videos. I am conflicted between the 13" and 15" because at the Apple Store they told me that I would never make use of the Quad Core Processor, the dedicated graphics card or even the 16 GB RAM. I asked about future proofing and they said it depends more on what software you use than how long you use it for. I plan to keep this new Mac for around 4 years so that is also something to think about. Portability is not my top priority and I can afford the 15" MacBook Pro but I wouldn't want to spend $600 extra if I am not really going to take advantage of the features of a more powerful laptop. That's my dilema, thanks for your thoughts!