Hi. I have a 15" MacBook Pro Retina, Early 2013. 2.4 GHz Intel Core i7, 8GB of RAM, Intel HD Graphics 4000 1GB and NVIDIA GeForce GT 650M. I run the Retina at max resolution and when I'm at my desk, connect it to a 27" Apple Cinema as the primary monitor (and continue to use the laptop screen as a secondary monitor). I'm moving to China in a couple of weeks and was thinking about upgrading to the latest version. The main difference is additional RAM and video card. I definitely feel the video card struggles to keep up sometimes with this high-resolution Retina screen. Do you think the upgrade is worth it? I figure it cost about $1500 by the time I sell this one and take a loss. I'm moving to China from the US soon, so if I'm going to do it then I should do it now; it's even more expensive there. Thoughts?