SWIFT VDI or INDICA VISTA Quadrajet or FiAT PALIO MULITJET,,,,which one to buy????

After going through the reviews of Swift VDI, FIAT Palio stile multijet or Indica Vista Quadrajet, i am really confused which one to buy.

 As fuel costs have gone up,i would like to go for diesel versions. The cars at the price range i am looking for available ones are only these cars.

Can any one suggest me in order of preference which one to take. My main concerns would be 1. Fuel economy 2.Maintenance cost. 3. Comfort 4. Stile (like interiors and exteriors).