Here's the background: My wife uses her MacBook all the time. I bought it originally for me back in 2008. It's a white MacBook with an C2D processor, pre-unibody style (no fancy trackpad). She uses it mainly to browse, Hulu, Skype and other web related functions. Never seen her use the optical drive and she's barely used half of the 120GB HDD. I want to get her the 11" MBA with 64GB SSD and 4GB of RAM. Questions I have: Can I buy the 4GB RAM model from a physical store or online only? Would stepping down to the 11" model be a big deal coming from a 13"? Let me know what you guys think! Time is of the essence!