Please check your local PC markets. Lamington Road if you are in Mumbai, Nehru Place if you are in Delhi, SP road if you are in Bangalore etc.
Cheapest GTX 1060 6GB is Zotac for around 23k. Amp edition is around 24.5K. 3GB is around 18k on Amazon
Corsair cabinets start from 3K depending on the model you want to buy. Check Amazon, md computers and your local PC market
2 TB HDD will cost above 5K. I would suggest going for 1TB WD Blue for 3K @ Amazon and 120GB SSD for 4k. For a bit more money, there will be a huge performance gain,