I need help deciding which Mac to buy. I'm going to college next month and have decided to buy a MacBook Pro. My problem is: which one? My current laptop is an ancient compaq, so this will be a big upgrade either way. I'm stuck between the 13" and 15" models. I'm going to use the machine for web, streaming video, some video/photo editing, and maybe some light gaming. I don't really mind having more carrying around more physical weight for a better computer, but the high price jump from 13 to 15 ($600) is a turn off, although not completely undoable if necessary. I guess the primary draw of the 15 for me is the dGPU/AMD graphics chip and slightly bigger screen size, but is it really that necessary for me? Also I've heard the dGPU will drain battery faster when it's active, which obviously is not good at university. Also what's the screen resolution difference between the two models? Will I notice a difference when streaming video? Finally, my university's apple store has a deal going where you can get a hard drive upgrade to 1 TB and a RAM upgrade to 8 GB for $219. Is that worth it? Anyway, sorry for asking such a redundant question, but any help is totally appreciated. Edit: Also, should I possibly be thinking about buying a refurbished machine?