My iPad 2 is 16gb. I went for the 64 + 4g this time around.
I have seen the app sizes jump quite a bit with the updates. I had about 5 gigs left on my iPad 2, but that was with zero media. I wanted to be able to support the bigger apps, load up some movies, and support additional use - I'm going cold turkey on paper, so I'll have a lot of notes and probably recordings to store in the future, and a lot of those notes will be PDF annotations, so I expect my usage to increase quite a bit. I don't know how much, so I figured $100 was worth the extra security space-wise.
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