I had a terrible experience with All ATP's when I did their ATP course. Wouldn't recommend it. Also, they pay their CFI's $9600/yr for working six days a week, 12 hr days.
No MEI there has more than 400 hrs TT because that's when they get hired by the regionals. If my experience was typical, I feel sorry for whoever is babysitting those guys in a jet. They were able to scare me plenty in a light twin. Flying was ok, but maturity and decision making skills were nonexistent. We had electrical failure in a PA44, VFR night, and my MEI (PIC) had not the first clue how to get down without his Garmin. No charts to be found on the airplane or with him. Might be a cheaper school than some others but you get what you pay for sometimes.
Don't know the cost but UND and Flight Safety are good ones. Delta Connection Academy is mismanaged and overpriced but has excellent training.