Hi all, I am having a huge time deciding between these two models: 1) Macbook Air - 13"; 8GB RAM; 256GB SSD; i5; 1.4GHz; $1300 or 2) Macbook Pro Retina - 13"; 8GB RAM; 256GB SSD; i5; 2.4GHz; $1500 I am an avid programmer and use a lot of CPU intensive applications to code. I am a student, and use the web for heavy, heavy research and need battery life. I also use Microsoft Office very frequently. Which one do I pick? I want a laptop that has good battery life and has the ability to run CPU intensive processes, while not sacrificing speed. Thanks all!