16GB was full after 1 month of use!
I have to swap out what I want on my iPad because it is full.
Get the most amount of memory you can pay for! 16GB will fill up, no matter what you do with it:
i.e.: some magazine issues that have their own iPad app are 300-800MB each issue.
some game apps can be as large as 500MB each
I have a navigation app that is 1.8GB in size (offline maps)
If you want to sync to movies in iTunes, these take up GIGAbytes, not megabytes, I have so much on my iPad I cannot sync w/my movies.
the iPad 2 has photo/video capability...the reason the cameras are not higher megapixels is because of how much memory they will take up.
This is not like a computer, there is no hard drive, no port to add a hard drive, ...you cannot add more memory or swap out for larger memory later on, 16GB will run out if you use the iPad. If it is just a toy gimmick, you just want the latest gadget sitting around, or if you are only going to read books with it, then go ahead and get the 16GB.