I'm getting ready to purchase my first mac book air coming from a pc (hp). I keep going back and forth on whether to upgrade to the 512gb flash or keep the 13" at 256 with 8gb ram and the i7 processor. I will be using the laptop for mainly photos, itunes, and internet with a few word processing applications. Do i really need the 512? I also know you can't upgrage the air's after they are built so i'd like this laptop to last me at least 5 years with plenty of space. I have about 5000 itunes songs currently. Please let me know. Thank you!