Hi, I'm planning to get a baseline retina with 2.3 (Maybe 2.6) Ghz CPU upgrade and 16 GB ram. I'm got gonna have the SSD upgrade as I don't use much storage already on my 2012 MBP Retina. This gets cheaper than the dGPU version. (Not so significant though) I mostly work in clamshell mode with a Thunderbolt Display. No gaming or 3d work. Mostly cpu intensive apps running. I also work mobile frequently and battery life is important for me. That's why I thought having no discrete GPU might be better. However I have a tendency to get mad about scrolling performance on apps and stuff like that. Would Iris Pro be just fine for my setup? Or should I go ahead and buy the dGPU one? Thanks!