But those are your requirements.
Maybe the OP does not have those, especially since movies can be stored externally (no need to have access to them 24/7), even music can, if one has a big library.
And a 70 GB Applications folder is not that common.
I have 10 to 20 GB of applications, depending on the project I work at.
A normal consumer probably has less than 10 GB.
But I agree, that 64 GB is quite small, I have such an SSD in my iMac and it sometimes gets quite small, and I don't even use Boot Camp.
OP, is there no way you can get another 100 USD to get the 128 GB model?
I'm currenty a high school studen leaving for Uni next year. I also live in South Africa, so money is tight. My parent's have agreed to pay for half of the computer as a joint christmas & birthday present, but making R5000 (600USD) here is tight enough. I've sold a couple of paintings I've done for R800 (100USD), saved money over the past few years and also worked through the holidays yet I'm still at just under R4000 (480USD). The 128gb is an extra R1500 on top of that, and I just don't think I'll be able to make that much money by the end of the year- by which I need it. I still have a 2006 white macbook which has brought me much pleasure, but the battery is swollen behond repair & I can't exactly say it's in quite the best condition right now, so if I was to sell it I doubt I would get much more than R1000 (120USD), which imo is most certainly not the best deal. I would much rather have an extra computer with 500GB storage, an optical drive & well as being a fulling working secondary computer than just a measly 64gb extra to my SSD :/
In other words, I don't think I'll be able to afford the 128gb
I'm only going to have a select amount of music on my MBA, and I'll keep other documents in the cloud. The 24gb left in my OSX will be used to store at minimum, pixelmator, adobe Illustrator, skype, chrome, netbeans (and other programming applications) and then iLife stuff obviously. The windows partition will store 1 game at a a time at most, then I'll uninstall it and keep the saves on an external hard drive.
Movies, photos & games will all be kept somewhere other than on the MBA itself, and I'll just be keeping everything I need on there.
My reason for upgrading is because the fans on my macbook are driving me insane (they even turn on for a youtube video), it's getting slow when I have lots of applications on & obviously the battery is completely gone (I get 30min at most). Also, I need somthing portable for uni... and games are just a plus above that.