Yes, the ex-showroom price include all the logistics. RTO taxes are levied by respective state governments, generally it is a predefined percentage of the ex-showroom price, in some states there are fix slabs as well. Generally the RC is valid for 15 years, but it varies state to state.
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.