storage

[Aaikikker]

hello, my straight-A son wants his reward in the form of an ipad2 and claims he needs a 32-GB as his mother wants him to share it with his sister...
The 16-GB costs 500 $, the 32-GB 600; therefore i'll pay 100/16 = 6.25 $ a GB, which i find outrageous since a 500-GB external HD costs around 40 $, i.e. 40/500 = 8 cents a GB!!! I'm trying to convince him that the 16 would be enough as he can always connect it to his PC to load whatever he needs at any given time - am I not right?
The extra 100 $ is not really what matters but I'd hate to be a victim of Apple's questionable business on that particular issue, on which i'd appreciate hearing your opinion...
thank you

You can not compeare an iPad with an external drive !
If you put a few movies and music on the iPad you will quickly use a lot of GB.
I think 16 GB is too less, certainly when they are going to use it with 2