You can consider Monero for your investment. Monero is the best privacy coin out there and with a market capital of $1.4 billion, has a lot of potential. The coin's total anonymous nature is its most attractive feature which is made possible by its ring signature. This has made the coin widely accepted among the financial institutions and a great choice to make transactions throughout the world which are secure as the information of the sender and recipient are kept private. Monero has the potential to cross the $400 mark by the end of 2018 and will give you good profit returns.