I've decided to get a 13" MBA - my first Mac in over 12 years. However, I'm not sure whether to get the 128 GB or the 256. And if I get the 256, should I upgrade the processor? The MBA will act as a "second" computer, mostly for me to use for blogging (I'm a style blogger). I also edit photos and sometimes, video. What do you think would be ideal for me? Thanks!