Let me tell you, if you are looking for a small car with good power, then take a test drive before you decide. I bought Santro Zip plus on 2003 march, its really worth I opt for this car, after I checked for alto and indica, definitely this is worth the money you spent.
I have covered 35k kms with all free services over, its again the performance is great..
I had been to long drives to steep hills and bad roads.., over night drives never felt tired
driving , but one cons about the car is back legroom, its really not comfortable for three tall guys to sit, good luggage space, and believe me a good mileage of 16kms on the city and 19kms on highway, the wheel base is good you can have a sharp cut in the hair-pin bends and in the city road traffic, if you have a passion is driving you will feel as good as riding a bike in the traffic, Zoom...... Zoom......
Service is also fine.... so whats waiting for keep this car in you list when you decide for small car with power and efficiency....good luck