Currently all altcoins are experiencing a slump in their prices. You can buy them but make sure about their recovery will take a long. I would suggest you to stick with Ethereum,Monero coin.
I also like Ethereum and monero because these are the best coins for investment, but apart from these two Altcoin, I will prefer to invest in Ripple because Ripple is one of the fast growing crypto in the market and people mostly like to invest in ripple because the market capital is also growing very fast. It is also an authentic and reliable Altcoin. You can trust it for your future.