I am planning to buy 6 MSI GTX 1070 for about $575 each and a single mining rig will cost me about $4000. I plan on mining Zencash at about 1% fee and my electricity cost $0.22 per Kwh + 5% VAT. Can someone help me out if this is worth to start mining, if its profitable for me still? Also can if you can advise me on the future risks of mining and what I maybe should know as I get started. I plan to over clock the mem/core and undervolt the 1070s. Is Zencash okay to mine or is it better to go for a more solid based coin like Ethereum?
Use a mining calculator to help you make those "profitability" decisions. While you can mine Eth with a 1070, it's not as efficient at it compared to an AMD card. So, it's best to stick to equihash coins like ZCash, ZClassic, ZenCash, Hush, Ubiq, etc. There are also lots of other coins/algos that nvidia cards do very well. Check out whattomine.com to get an idea.