Can someone tell me where my thinking may be flawed? Looking at 13" versus 15" retina MBP, $2,199 will get the following: 13" - smaller laptop, 2.9GHz dual-core i7 15" - larger laptop, 2.3GHz quad-core i7, discrete video card with 1GB GDDR5 memory The SSD drive space is the same on both systems. Is there something I'm missing or is the size of the 13" the only advantage? I am looking at the 13" because I'm not in school anymore and my 2011 15" is slightly larger than I would like. However, I have a 2GHz quad-core i7 with 16GB of Ram and the hit I would take may not be worth it. I guess I could get a SSD to put in my current system.