Naivedyam, Southy, Tenali- The Andhra Kitchen are some best options to try for and are really pocket friendly.
Naivedyam is the best place to go for south Indian food. Pocket friendly + smile on your face you will get both.
Hey, you should surely consider Saravana Bhavan, Cp . It has delivery , Takeaway as well as dine in option available at this point of time. Go for it!
Sagar Ratna and Karnataka Bhavan
Sagar Ratna ,Malviya nagar. Karnataka cafe , Yusuf sarai
Karnataka Bhavan at Moti bagh is good
Most South Indian places are pocket friendly. Naivedyam is my personal favourite though.