The car has been offered with the length adjustable seat which makes it compatible for you. Moreover, you may visit the nearest dealership and take a test drive of the car so that you may evaluate the car on the basis of comfort, feature, and compatibility.
The exact information regarding the cost of the spare parts of the car can be only availed at the nearest authorized service center. We would suggest you visit the nearest authorized service center for further assistance.
In order to know the build quality of any vehicle, you can compare the kerb weight of the vehicle. The kerb weight of Tiago, Swift and Elite i20 are 950, 855 and 1066 Kg respectively. So in terms of built quality Hyundai Elite i20 will be the best option.
For the availability of and prices of spare parts, we would suggest you walk into the nearest service centres as they will be the better person to assist you. You can click on the following link to see the details of the nearest service centres and selecting your city accordingly - Service centre.