According to me top 15 altcoin with highest total cap altcoins will be good to buy but you should be updated.
And they are listed coin on exchanges and these kind of token are famous . You have one more opportunity i am a ICO investor and in these days i found IEO is becoming more popular because of its security mostly ico is switching from ico to IEO .
https://bitcointalksearch.org/topic/m.51165604
One of my invested project that is Authpaper it is also going to launch IEO and this is the great thing to me because there tokens will comes under security and they can proove that they are genuine and it is worth to invest in it .