I'm hoping to go with T-Mobile's $30/month prepaid plan. I barely talk on the phone, but I like data, so 100 voice minutes and 5GB data is a plan that's practically made to order for me. I have the feeling that T-Mobile coverage is pretty bad around me, though, but I'm at least going to try it out.
That leaves AT&T which, I believe, has good coverage around me. Sadly, they don't have a any bargain priced prepaid plans like T-Mobile does, so I'll likely do AT&T through Straight Talk to save 20+ dollars, or whatever would be, a month. That's what I voted for.