It'll be best to stick to petrol, as the premium you will be paying for a diesel or CNG won't be justified for a mere 1000km monthly run.
Between the four cars you've listed, the Hyundai Venue seems to be the most rounded option in terms of space, comfort, features and sophistication. The new Venue hasn't been crash tested as yet, however, like others, it packs in all the essential safety kit like 6 airbags, ESP, hill-start assist, etc.

