Hi, I currently own a mid-2012 MBA with 8GB ram and 128GB flash storage. I was thinking of selling my current MBA to get the base model (4GB ram / 128GB) of the latest MBA. I'm on a tight budget so I could only afford the base model and not upgrade anything. Is it worth selling my current MBA with 8GB ram for a newer MBA with lower ram but longer battery life ? The battery life on my current MBA is no issue to me but having a longer battery life seems better. I'm also planning to use my MBA for at least 4 years or so. So maybe keeping my current one with the 8GB ram is the better idea ? What do you guys think ?