I'm looking at buying a new Macbook/Macbook pro. I currently have the early 2011 Macbook pro 15 inch. It's a bit scratched and I'd like something that looks a little newer. I'm torn between the Macbook and the Macbook Pro 13" (lower end of each). I've already upgraded my 2011 Macbook pro so that it has 8gb of RAM and I've been told by a friend that the upgrade to a 2015 Macbook pro would be so insignificant that it wouldn't be worth it. What do you guys think? If I do stick with my current Macbook I'd quite like to replace the bottom (underside) of the case since that's the area that's scratched. Are there any reputable yet cheaper sellers for this?