Hi, I recently returned my rMBP 13 because i wanted to upgrade to 15. I dont know if im gonna go with 8 or 18 GB of ram. What do you think? Is it worth the extra 300dollars(counted in local money) to get the extra 8gb? Im gonna use the computer as my main computer aswell as my working computer where i do a lot of programming and some minor photoshop work. I occasionally play some games like SC2 and CS:GO. And maybe ill install some new games later on. What do you think, do i need the 16GB?