Hi Friends, I am looking to get a rMBP soon. I want to get a beast that will handle what the world throws at it in the coming years (ideally 4-5 years at least), so I want to get it with some upgrades (16gb RAM and 512 SSD for sure). If I do those upgrades, it will end up being only 100$ less than the upgraded model with the dedicated Nvidia GPU and 2.3 GHZ processor. My question is, it worth it then to just go for the upgraded 2,599$ model? Is there any disadvantage to the dedicated GPU (battery life, heat, etc.?) Thanks!