Re: It's (not?) all in the hips
Tohei founded Ki Aikido, or Shin Shin Toitsu Aikido. There are several schools that are offshoots of his 'style', including Shin Budo Kai in NYC (Imaizumi learned under O-Sensei and Tohei) . On the shinbudokai.com website there should be a link to other styles related to or that came out of Tohei's.
Video on Tohei is hard to find, Aikido Journal has some clips included in a 'sampler' DVD of a variety of instructors. I found a VHS from Budovideos that shows Tohei in the late 60's - a find.