1. Processor: AMD Ryzen 5 5600X - Rs. 23,499

2.Motherboard: MSI B450 Tomahawk Max - Rs. 9,899

3.Graphics Card: Nvidia GeForce GTX 1660 Super - Rs. 26,999

4.RAM: Corsair Vengeance LPX 16GB DDR4 3200MHz - Rs. 7,599

5.Storage: Kingston A2000 1TB NVMe SSD - Rs. 9,799

6.Power Supply: Cooler Master MWE 650W 80+ Bronze - Rs. 5,000

7.Cabinet: Ant Esports ICE-511MT Mid Tower Gaming Cabinet - Rs. 4,299

Total cost: Rs. 86,994

The above build is slightly over budget but I believe it offers great value for its price. If you're looking to bring the cost down, you could consider the following changes:

Downgrade to Ryzen 5 3600X or Ryzen 5 2600X

Choose a cheaper motherboard such as Gigabyte B450M DS3H or ASRock B450M-HDV R4.0

Consider a lower-end graphics card such as Nvidia GeForce GTX 1650 Super or AMD Radeon RX 5500 XT

Choose a smaller SSD such as Kingston A2000 500GB NVMe SSD

With these changes, you should be able to bring the cost down to around Rs. 70,000 to Rs. 75,000.