Most of altcoins are down with this market. So many experts and news say BITCOIN will go up in this year end. I think if Bitcoin goes up, other alternative coins are going up. So is my point true, What are the best coins to buy with this low prices.. Or Isn't this the time for buy coins?
Anyone you buy now is okay, as long as it is not among the shit coins in the market. But bear in mind that bigger profit usually comes from the top coins like Bitcoin, ETH and BCH, cause those ones are like highly volatile and its best to buy them when they are cheap and you will make huge profit when they start pump.
I heard Ripple is good too, it has made it to the third position on coinmarketcap, but I have not invested in it before, so I dont know how it works. Good luck.