It should be noted that the limited data plans for both AT&T and Verizon mean that at the max 4G speed of 73 Mbps, you could use all your bandwidth for the entire month in less than three and a half minutes (2 GB plan). The overages of $10/GB per month on both services mean once you go over your plan, you'll be looking at a little over $5/minute in new charges. It is possible (though highly unlikely) to rack up over…
Don't most people, really, use iPads over wifi? Or am I just one of the cheapskates who bought one without 3G or 4G support? I bought an iPad 2 last year and I didn't even consider buying one with a data plan. I am near wifi about 99% of the time, discounting driving, hiking, and airplane time. In a pinch, I can check email on my Droid. Eventually 4G will become inexpensive, but it isn't right now.
Still, I bought a 3G ipad only because of the GPS chip in it. Even without the data plan it's quite valuable if you hook your ipad to your phone's hotspot or another wi-fi network.