I'd like to buy it from Best Buy but it doesn't appear that I can get the memory upgraded from best buy... Amazon didn't offer an 8gb model as far as I could tell. So to get a 8gb model I'd need to order direct from apple, or maybe macmall? Can someone clarify for me? One other thing. So suppose I buy the 4gb model. I know it's not user upgradeable but can the memory be expanded to 8gb after the fact at all? I know this would entail spending a fair amount of money at Apple to do so but I'm just exploring my options. Ditto updating the SSD? Thanks.