Re: best aikido you have seen
The best aikidoists I've seen:
Don Angier--soft, subtle, and effective. 25 years later, I'm still trying to figure out some of the techniques he demonstrated.
Gozo Shioda--incredibly powerful aikido.
Clyde Takeguchi--small movements with subtle weight shifts
Mits Yamashita--probably the most martially effective aikido I've ever seen.