If you pick the coin under $1 then it comes with graeter risk also,it is hard to predict the potential level of coins at early stages so it is better to concentrate on the coins with good reputations than cheap because reputed coins will give sure profits but the profit level maybe less.Eventhough some cheaper coins also predicted to have good futute.They are

1. NEM = $1.42 ( current price)
   It is one of the coin which is in the market for too long but recently the price made huge bump and in 2018 the price of each NEM may reach $10.

2. Siacoin (SC) = $0.06  ( current price)
     SC is one of the undervalued coin as per the experts soon the price will explode and it is also a coin which is in the market for too long.