if you go this year end i think you will be able to get pretty good deals.. now many airlines are trying to promote people to go to japan. Radiation will be there for a while la, but anyway you will only be there for a few weeks so shouldnt have such long effects unlike for those staying there.
Japan is cheaper to visit now, think the food also cheaper. Even with small amounts of radiation in the food but if eat only a short period of time it wont really affect health would it?
now SQ has very good promotions for japan, to get people to take flights to japan. You should go this time! I dont think it's still very affected, Singapore still keep importing japanese food haha