Strange, but like I said the Apple store I went to, got a bunch 64 gb whites, but out of 64 gb blacks since launch day (that what the apple store representive told me). If my assumption is right, if majority of guys goes for iPhone blacks then most of the man, get the most capacity that they can get hold to. Like me if 64 gb is available I will get it. Im sure my wife is fine with 16gb.
About surviving 32gb I think it is better to set up your new iPhone as brand new. Then download only the apps, that you know you will only use. You will be suprise that you will have a lot of space left. For example: garageband or imovie. Those apps are almost half a gig each. Do you really need to create movie or music using your iphone.
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We are not in pre school, but your man instinct told you to get the black one. Until you find out that 64gb is only available in white. Now you try to justify, that white is fine.