I find Monero to be one of the best choices as it provides complete anonymosity in its transactions. The transactions made through Monero are secure and untraceable. The identity of the sender and reciever is kept private. Also with a market capital of 3 billion dollars, within 2-3 months, its price can reach 300$ per annum. So the coin has a lot of potential and you can expect a good amount of worth from it.