I like to always buy some Potcoins (yesterday I got 80% profit with Caancoin) they are extremely unstable overnight they go up 100% or fall 50%, which can be a very interesting profit in a short time.

Another coin that I'm betting on in the last days and Nxt, it has peaks between 3200 and 4700 and its volume on Bittrex is immense. Another one that is growing and the Miota (Iota) besides having a reasonable value the trade of it has no rate what can be a good one for small transactions.