Re: New to aikido: 2 questions; ki aikido and manhattan dojos
There are two dojos in New York City that are taught by direct students of O'Sensei.
One is New York Aikikai. Yamada Sensei and Sugano Sensei teach classes there.
Shin-Budo Kai: Imaizumi Sensei teaches there. He was not only a direct student of O'Sensei, but was head of Ki Society in the Unites States before he became an independent teacher. I have been a direct student of Imaizumi Sensei for over 20 years now.
Bond Street Dojo: ASU dojo (associated with Saotome Sensei) has a lot of senior teachers there, although no direct students of O'Sensei. That is another very good place to train.
I would frankly go as close to the source/founder as possible. Try all of the dojo's for that matter. I have a markedly different opinion of Sensei Nour than the other posters and would not recommend that you go there if you are looking for "Ki."