Games pretty much is the main storage hog, especially if you have games that needs additional data (ranges from 300mb to 1+gigs). Other than that if your a root user and keep your nandroid on the internal sd card, that'll kill your storage real quick (1.5 gigs on touchwiz rom for 1 nandroid)
However even with a 16 or 32 gig external sd card, I couldn't see anyone running into storage problems (I haven't yet with my s3), that is unless that person downloads music/videos constantly, as well as having the device filled up with games.
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