I consider that it is good time to buy this coins now: Waves, Ether and Bancor. Waves has a more advanced PoS algorithm than Ether and will achieve its price to the end of 2018. Bancor is the best protocol to exchance erc-20 tokens in my opinion. As for ether, it is the great crypto which will beat BTC in near future thanks to the strong team of developers and widespread use.