No one of course has a crystal ball. But my buying choice for my late 2013 27" was guided by the simple fact that my primary application is Aperture. And the current version (now some 4 years old) doesn't employ the GPU for processing. So, the Nvidia 755m GPU was entirely adequate. And saved me about $200 over the much more powerful 780m chip. But I wonder if I will have to scrap my computer when the refresh of Aperture comes out requiring a more robust GPU. I would like to insulate myself from technology sticker shock. Any thoughts on the subject?