I don't know which one to get. I was looking to get a base model rMBP but don't know where to buy it. It's $2000 at the Apple store with an education discount of $200 and it's $30 less here: http://www.ebay.com/itm/Apple-MacBo...68442326?pt=Apple_Laptops&hash=item51a577cad6. Suggestions?