So I'm real interested in the Air's 11" size... but the 2GB RAM is a killer. On the apple website, it LOOKS like the ram cards are standard, but I've read others saying they're NOT standard and they're not user upgradable since attached to the motherboard. Can someone who has the 11" let me know either way? I want an 11" with 4GB RAM, so if I have to custom order it I will, but it'd be easier and cheaper to walk in the store, but a base unit, and pop in 2x2GB cards if it'll take standard RAM. If you can't upgrade the 2GB model sold in the store that seems like an obvious reason for me to buy it through CTO Thanks!