How much capacity is good for an iPad? Does one need 3G on it?
I'm absolutely fine with a 32GB WiFi only iPad. 32GB is enough for most of my music, audio books, all the apps I use and some tv episodes. I never missed 3G on my iPad. Just one thing: you won't have GPS without 3G. If you have an iPhone, you can tether both, data and coordinates via WLAN (not bluetooth as previously said).