Personal Trainer Certification

I need to get my Personal Trainer Certification. I’m looking for input on a legitimate Nationally recognized organization with whom it would be worth spending my money and time.

Also, has anyone ever found and completed a good certification course focused on Children’s fitness? Any input and advice will be greatly appreciated.

P.S. using google I came up with AFPA, NFPT, ACE etc. but would like some firsthand opinions.