I don't know where you are located but if you have 80k to invest it would be best to buy a small house by adding another small amount of money , in US a good small house cost about 150k depending on the state you are located.

If you are firm on your decision and you want to go with a mining adventure, my advice would be to buy 50% of the money , your favourite miners and the rest of money to buy bitcoin,ethereum,litecoin and zcash, the top 4 major coins and hold.