Alto, Cultus, Coure . You can get used or new. For new cultus you will need more budget but you can get used cultus in low milage and in good condition in your budget.
Cultus is better than coure and alto and serves well for your purpose. Every car has advantages and disadvanatages, For you either new alto or coure ,OR used cultus can be an option.
There are also few JDMs but you will need to check their compatibiltiy with CNG which in most of the case is a ?