Welcome to The Automotive India.
We too have a 2006 Honda City Idsi. It has completed 45k kms (i know its too less), and still strong. Never ever have i heard a rattling, forget the engine trouble.
Now coming to your query, i feel if you are determined to retain the car for some more time, then go ahead without any second thoughts. My dads colleague who purchased the car along with us has completed 90k kms without any major fuss.
The minor issues which occured were a result of accidents.
So go ahead, and enjoy the butter smooth i-Vtec