While your needs may seem defendable... Or even reasonable to this audience... Ask yourself how much the mainstream tablet user needs. Who keeps tv shows after they are watched? How many movies do you need to lug around?
I'm not talking about your needs or even your friends... I'm talking about the other majority of users out there. On the bell curve, your needs are probably a notable exception rather than a marketing target.
Ok then most users will at least have what, a least 4gbs of music, they at least fool around and take 3-4 gbs of video and images, most will also store some PDF and other files in good reader or similar browser storage apps at about 4gbs, most will also have 3-4 games at the very least amounting to 3-4 gbs, the apps they download at the very least will be another 5 gbs as there are a lot of cool but storage costly apps there too. Most users will also have some iTunesu, podcast and audiobook content at at least, at the very least always, 3gb, and at the very least each one will have some 4 gbs of added content be it audio recs, large useful apps, large video files for their kids, self, spouse, large stored map apps, etc. etc.
So at the very least and with very conservative content management, most users should have about 30gbs on their iPad, which renders the 16gb one a joke, the 32 gb one filled up and inadequate, and the 64gb one merely decent.
We are bsing about here, in this day and age and with all the content for the iPad, the starting model should have been 64gbs, in line with the air circa 5 years ago which didn't have all these special apps and capabilities to begin with, and ram nowadays is dirt cheap, dirt cheap. Who would have thought that the iPad would be aiming at iPhone storage levels in 2012? And eff the cloud, the cloud is useful but hardly so when you don't have some storage on the device too.