I would suggest you to go ith nissan sunny because fiat is too high on maintance. Ur overall cost of ownership will be much less with Nissan sunny. If u can wait for about a month or two nissan sunny will be launched in diesel variants also.

for how many years are you planning to keep the car Nikhil?

This tool helps you to decide between petrol and diesel:
i made the comparo using this tool and it gave Linea to me as the EMI's are low.
Both the companies have pretty bad A.S.S but Somewhere Linea raises its hand because its merger with Tata which has 2nd largest service network,so Linea seems to be a better buy.

Whoa dude... even Nissan's ASS sucks... and they have very little service centres, moreover linea for sure is a head turner and is a comfortable vehicle moreover you could get it serviced across india as tata services it and u always know, diesel saves you money...

Thanks for the update people...

@Aravind: I'm planning to use for 4 years easily...

Any other suggestions?

go for rapid diesel

honda city is best

the car with same engine as linea, and relatively cheaper to maintain and no horror stories of A.S.S is Maruti SX4 diesel... its a value for money
though if u don't mind the brand image then the cheaper tata manza runs on the same engine as linea, its a spacious car with awesome features and good build quality..

if ur goin for petrol sedan dn look no futher other than CITY..its best petrol car ever..&if going for diesel go for LINEA MJT its feature rich,spacious &also its ride n handling is also good.but 1 thing bare in mind dt it has low grnd clearance.dts all.®ardin other sedan also look out for SX4 diesel or newly launched RAPID TDI.