What do you think the possibility that Apple will offer a 512GB SSD on the new Macbook Air be? And do you think it would be quite expensive? I'm considering a Macbook Air but the HD capacity is holding me back. Also, how much faster does the SSD make the Macbook Air vs the Macbook Pro normal HDD? Right now I have 8GB of ram in my Macbook Pro, if I switched to 4GB in a Macbook Air would there be a dramatic decrease in performance?