I'm considering an 11" MBA for the sole purpose of writing and reading texts (I'm a writer) plus Internet. I don't need 128 GB. I need about 40. Maybe less. Is there any reason I should still not buy the lower price model? Will those 2 GB in RAM be noticeable in my case? Would 4 GB make me happier? Is the better processor this year enough to not get obsessed about it?