Hello Everyone !! After days of comparing the air and pro. I finally decided on getting a Pro! I am going with the 13 inch because it is in my budget. I had a few questions before I go ahead and buy it . 1) I am planning to change my hard drive in the future when SSDs get cheaper. Should I keep the stock HD of 500 gb or get the 750gb? ( I already have two 1tb external drives. ) 2) Should I upgrade the ram from 4gb to 8gb now or wait and buy an OEM ? 3) This is going to be a gift from my wife. If I decide on a refurbished model is there chances that the casing will be scratched? Thanks in advance for the advice!