I hail from middle class, earning 46.5 pm, my loan eligibility is upto 30 lakhs.

Hey I would suggest you Perumbakkam, Anna Nagar, Madipakkam are some of the localities for Individual houses. Basically South Chennai would be very good placeto stay.
Anna Nagar boasts an established social and civic infrastructure. Police Stations, street lights, Fire Stations, reputed schools, colleges, government colleges, private hospitals, malls and local markets help in boosting the property value of this place.

Madipakkam is nice locality and very close to 200 feet railway feeder road which will take directly to airport without any traffic difficulties.

Perumbakkam is a very good locality. And easy access to IT corridor and near to Global Hospital and reputed schools like Bharathi Vidya Mandir. It is well connected with just 5 minutes drive to the famous Iskon temple are vailable in this locality.