I can't believe that the base is just 256 GB. Back in 2012 when the 15" rMBP first came out, I bought that. I had to sell it a year later for the 2nd gen because 256 GB is awful. It means that you can hardly store any media on your computer, few applications. It's also very difficult to use the computer for pro apps, since most of those require a lot of storage (design, video editing, music production, software development, etc). If you have to pick between the two, upgrade the storage for sure.