I believe that at the moment Litecoin, Ethereum, Cash, Dash are experiencing some difficulties and are not the first in terms of prospects.
The fact is that today competitors ethereum have recommended themselves very well, although ethereum I consider the most promising coin of all that is available in the Coin Market Cap. But you should also pay attention to the stellar, neo and waves.
Now XRP should be noted that the coin is likely to rise further in the future, maybe XRP will increase to $ 1 but in my opinion should invest in them and hold until the end of the year 2018. XRP values will go up even higher.