Hi guys. Complete mac newbie here. Always been a Windows (and Linux) user but I have decided to take the plunge and try OS X. Also I really really like the retina screen and the 16:10 ratio. I am eyeing the base model with 2.4/8/256 and educational discount. Unfortunately there are no refurbished base models available here in the UK. I have 2 questions: 1. Do you think 16GB ram are vital? I am going to run one VM all the time (Ubuntu). 2. I can wait until the end of August but I need a new machine by September. Do you think there is any chance of an update on the 15 rMBP before September?