It's one of the good coins to invest for this year but for 2018 I'll say that stick back to bitcoin. @OP do you invested with bitcoin already? Before you ask for those altcoins that are good to consider for investing for this year, consider first to have bitcoin. No doubt that bitcoin is the best coin to invest but if you are not interested about it. Litecoin and ETH will be the best altcoins that you can invest and also add to that list Monero. These are my top priorities but it is followed by other altcoins.