It will be interesting to see if the iPad announcements recognize the changing competitive landscape in anyway. The pattern that Apple is establishing is that they won't change pricing or memory on the flagship product; instead, they emphasize a new, lower-priced alternative (iPad mini, iPhone 5c).
Assuming no change in pricing, I'll probably drop back to 32GB. I had 32 on my iPad 1 and felt cramped, so I went to 64GB on my iPad 3. However, the iOS7 music app is so underwhelming that I have almost no temptation to put music on my iPad any more. Most of that storage would be for video, with some for apps and docs/books. For music, I still rely on my iPod Classic, or quite possibly my Surface Pro where I can use iTunes or Xbox Music, both of which are much better than the iOS7 music app.