Tata Nano had some manufacturing drawback but now it is going to bless with some additional protection features and the company will assemble these parts free. After this fitment the Nano will more secure.
New Tata Nano with EasyShift is available at Rs. 2 lac (Ex-showroom, Delhi), and the final cost depends on the valuation of your car. So, first get the valuation of your car from authorized Tata dealer, so he can give you a final quote for the new car.