I use Ting (my actual phone is connecting to Sprint's network), and I spend about 99% of my time in North Raleigh, between just north of 540 and 440. Coverage is good (voice is a little spotty in my office and at home, but data is good everywhere), and for my level of usage (<200 min voice, <1GB data, 0 texts), I'm only paying like 18-30 bucks a month for it (ting charges for usage, so the amount varies month to month - if i'm super strict about data and voice, I can get in under 20 bucks, but 25-26 bucks is more typical).
ETA: I travel to DC regularly to visit my brother; coverage is crap on the train, but fine in the city. Sometimes go down to north florida to visit my folks and extended family, Sprint coverage in Florida is some ho-o-orse cra-a-ap, let me tell you.
ETA2: I had Verizon for several years before I switched to Ting -- service was always solid and fast, but for going to $75/mo to <$30/mo, I'll take the coverage and network being a little slower.