btw, you don't necessarily have to work at the school sponsoring visa, but they 'sponsor' in the overseeing sense, even at other job.
Delta Connection Academy was mentioned elsewhere couple years ago for J1, so I presume they did same paperwork as the other original J1 schools, for F1 sponsorship rights.
As for schools 'missing' in your list, there are two other places, both helicopter schools:
Mauna Loa Helicopters
Bristow Academy
Obviously, Hillsboro Aviation do both fixed wing and heli training.
I got no clue about price/cost differences, but if you're set for getting job as CFI, the potential likely monthly/annual flight time, hourly pay etc should be considered. Often people spend tons of cash on whole training and can't even have enough money to pay for regular/frugal living cost on low hourly wages not flying enough.