If you're a foodie and have good appetite; Rajdhani is a must. They serve a lavish platter of authentic Rajasthani and Gujarati food. The platter has a variety of dishes and breads; of course there are sweets in the end.
The tiny fulkis (rotis) are the cutest. The size ensures every one tries each kind. You can get as many as you like.
It would cost around INR 320 per head. Like most thali systems, this one too is bottomless. Have as much as you like.
I have eaten at Rajdhani in 3 different states - Delhi, Mumbai and Bangalore. The staff is great and makes sure you are served well and your thali is never 'khali'.