I'm using a 16gb right now, and it's perfectly fine.
But but but...
I'm one of those that seems to have to travel, even for groceries, with their entire music collection, and over 100 apps, five of which I use nearly every day...
I'm a Digital Hoarder!
OH! That doesn't include the literally THOUSANDS of screen shots, and pictures of stuff for the grocery, reminders, funny bumper stickers, Stupid Human Tricks I see, kid pics, etc...
And ebooks, a few videos...
'Stuff'