Hi. Mac noob here. I'm planning on buying a macbook pro as a second computer. I have narrowed my choices down to an older used macbook pro. Either a macbook pro with a 650m or a macbook pro with the iris graphics. This is more for basic tasks, and acting as a streaming computer (1080p60fps preferably, with be on bootcamp.) In the end, if I need extra power, I'll pay for an external gpu reader and an older graphics card. Light gaming, for times I cannot use my PC to stream the game over to the PC via in-home streaming on steam. By light gaming, I mean things like emulators. However, the main purpose, is for school work. I just like the idea of having a computer to carry with me. Like word processing At the same time, I need the macbook to have an i7 and 16gb of ram, and it MUST be a 15.4in model. So this is really down to, pay for gpu or iris graphics? Which would you recommend getting?