I'm on the $60-70/month T-Mobile plan that gives me truly unlimited 4G data; no throttling. I might not use more than 2G a month most of the time, but if I need to use more, I don't have to worry (such as when I had to go out of state when a family member had emergency surgery a couple of months ago).

I wouldn't switch back to AT&T as a wireless carrier even if someone paid me every month.