Do you have an internal or external hard drive as storage? Or do you you roll with the just the 128GB. Also wondering how much space a few Apps/OSX take up. I just recently ordered a refurb 15" MBP (First Apple Computer) and today ordered a 128GB Crucial M4 as well as 8gb of Ram so I'm wondering what I'm going to do as far as space...I only have 119 GB space taken up on my PC and I've had this computer for 3 years and have a bunch of files that I could store on an external hdd.