Then perhaps the best way to do it is for you to rank all the coins you think are very good for investment, according to priority. And then divide your money accordingly and buy as many of the coins you want to have. There is no better strategy than spreading your investments. It is much better than focusing all your investment in a single coin however solid the coin may be. Bitcoin is perfect for investment, for example, but Bitcoin with Ethereum and Monero and Waves and Ethereum Classic is definitely much better.