Ok so I do I lot of work on Rhino 3D, Sketchup and too Revit. I also use Maxwell and sometimes VRay for rendering. My current 15" Macbook pro with Iris pro graphics really sucks for this. When I move models around they get laggy and often freeze and crash. I do expect rendering to always take a while. Should I go with the Thunder2 and a GTX 970 with a PSU or would I be fine with the built in AMD R9 m370X of the higher priced macbook. The GTX kills it on benchmarks however the GTX requires a PSU and its hard to take around.... Thanks!