In Central Kentucky, I have never been let down by Bluegrass Cellular. They always have a great special going on and let me get the latest, greatest phone for a good price. Plans start really cheap, and work their way up.
I get unlimited bluegrass to bluegrass calls...which is a definate plus since all of my extended family uses bluegrass cellular.
Shop around, compare. I wasnt able to find better coverage in this area.