I'm a newbie to iOS development and I'm looking to buy an iPad to test out what I'll be working on. The biggest question I have is whether I can stick with a WiFi only model or if there are considerations to take into account in terms of data access protocols that mean I should get the WiFi + 3G model to make sure the data communications work properly over 3G? I know there are certain apps that can specify "do this only if using wifi" (like NewsRack downloading images for RSS feeds, for example), but is data connection-agnostic unless otherwise specified? I'd LOVE to stick with the WiFi model, but if my development's going to be hamstrung by the inability to see if things work properly over 3G, then I should probably buy the WiFi + 3G model. What do you guys think?