I travel a lot and my 15" MBP is becoming a pain to lug around, so I thought I would turn it into my "desktop" computer by leaving it connected to my external monitor, and get something smaller and lighter. I was going to buy the Air, but when I saw how thin and light the 13" rMBP was, I was sold. My only issue is with the RAM. The base has 4GB, and since I can't upgrade it in the future, I was wondering if I should get the next model up with 8GB? I don't do a lot of heavy stuff, maybe just some simple photo editing in Aperture and really basic editing in iMovie. I was just thinking about future OS releases. I wouldn't want 4GB of RAM to be the reason I can't surf the web properly anymore. Do I have reason to think 4GB wouldn't last me for a few years on a laptop meant for email, word processing and web surfing? The standard 128GB SSD is good enough, I can always use iTunes Match or Google Music to access my music on the cloud, plus I always have my iPod with me.