I've had nothing but problems with my windows computer so I'm finally switching to my first mac, so i apologize for any stupid questions in advance. But anyway, I'm gonna get a MBA 11 inch and was wondering if I should get the 2GB RAM with 64GB flash drive, or is it worth the extra money to get the one with 4GB RAM and 64GB flash, or get the 2GB RAM and 128 flash storage? All I would really use it for is using the internet, itunes (16GB music), typing papers, and the occasional powerpoint. If i get the cheapest one i will most likely get an external hard drive. I really dont know too much about stuff like this, especially macs, so any help works. Thanks!