well Rafaelle has a point. Japan uses american standarts so electricity is 110v and Tv's are NTSC. And it's impossible to find multi system Tvs except from Duty Free shops in Akihabara and the like. But the best solution is a LCD-Tv or LCD which supports 15Khzvertical-50Hz Horizontal. Last time I was in Akihabara I saw some LCD screens which supported these.
Also I recommend importing PAL amigas from Europe and 110v PSUs from america. I usually buy dead big box amigas here and put mobos imported from europe. NTSC mobos can give you headaches with some software (especially ECS-OCS systems).
by the way, in case you don't know, jmbattle is
AIAB fame

Doh, I live in Chiba too

At Gyotoku, near Urayasu (Disneyland).