Annu south indian express mansarovar is a good place for hangout if you have a plan for a south indian. its a place on madhyam marg. it has wide variety of dosa and other south indian dishes. they are serving 101 types of dosa starting from 40rs.
Actually it more like a hub of variety fast food. you can have a paani patasi, south indian, and icecream faluda and matkha kulfi. they dont have a good ambience and sitting arrangement but enough for having your meal. it is good for a casual outing but not appropriate for family outing and dinner. but definately you can have a good south indian experience and wide variety in south indain style dosa and other items. definately one should visit and taste the south indian style dosa.