So I'm potentially looking to upgrade my current MBP (early 2011) and have been playing around with the 2013 rMBP in the Apple Store. I really like the portability of the 13" vs the 15". But I do love the nice screen of the 15". I don't really do much past the basic stuff like web browsing, iTunes, email. I do like to have lots (sometimes 20+) tabs open in Safari though. I've heard that going from i5 to i7 on the 13" is not much of a jump given they're both dual core. Plus I was considering going with the 16GB of ram. Also is there a big difference between Iris and Iris Pro?? I am concerned about longevity as I'm not made of money. No matter which one I do get I do want a 1TB SSD. In any event would the 15" be overkill??