I know that Nishio sensei has a few dojo's in the warabi area. They are definately worth visiting if you want to do aikikai aikido. It should be possible to find a dojo where either Arisoue sensei or Tanaka sensei teaches. Both are very experienced.
You could contact Shishiya sensei (student of Nishio sensei). I know he's got a dojo in Tokyo, but I don't know exactly where it is. Check out:
http://www.asahi-net.or.jp/~bk2i-ssy/
I REALLY wish I could show you myself, but my wife don't want to move to Japan...
Best of luck