I think the best and most save coin for you to buy and invest in with $2000 is ETH or BTC. These two coins are the main crypto currencies of which bitcoin is the father of all currencies while ETH is like the mother because it is the second best crypto coin after BTC. So I think you should buy and invest in ETH or BTC because these two coins has a greater future and their price will moon very high if you can hold them on a long term investment.