^^^^ This is the most sensible thing I've read in this thread, especially the part I've highlighted.
We have a total of six ipads in our extended family--three are 3G models, three are wifi. Three 16 GB, two 32 GB, one 64. All are used very differently. I personally went with the 16/wifi because I don't do video at all, all my music is stored on my iPhone, and I didn't want an extra 3G bill to pay for a device that rarely leaves the house. I still have 9 GB left, though mine's in use about 10 hours a day. My husband went 32/3G-- he loves to watch movies on his, put a bunch of music on it, and it goes everywhere he does. The other two large capacity/3G owners travel around two weeks out of every month, and need both connectivity and storage.
Different needs, different devices.
I usually agree with the "buy the best you can afford" rule, but the iPad is built
to take advantage of cloud storage in a big way, and depending on what it's used for, maxing everything out on it may just be a waste of money. It absolutely would have been in my case.