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I suggest you to go for Swift. Since the Jazz is a less popular model It will be better to stay away. And in Swift you have the maruti reliability across the country thanks to its service networks.
Go for the diesel one. Who knows, you & family may use the car more then 300 to 500Kms also. You may even go for a tour trip also in the car for around 500Kms. See for the future. I'm having both petrol cars. One is converted to LPG ( The Palio). But still when i go for fueling my car i envy the diesel cars.
You don't need to calculate the expense for every trip. & the diesel cars give a very good FE then any other petrol cars. resale value is good for diesel cars.
Forget about maintenance. Now a days diesel cars are equally good and less to maintain then the olden day diesels.
Bro go for the Diesel Swift
. But i think its available only in VDI model not the top end.