The Kia Sonet diesel is a good option, and you can safely go ahead with this.
However, if rear space is important to you, then you will find this very tight in the Sonet, especially so in comparison to your Toyota Glanza. If this is an issue for you, then you could consider the new Hyundai Venue; rear space is better, and on the whole, the car is a better option too.
However, if you are not keen on the Venue, then you could consider the Mahindra 3XO, which has good space as well as offers a good ride along with engine performance.

