Zeitcoin, one of the highest rewarding proof of stake coins out there, with fast transfer times and promise of a high staking return of 25% in the fist year, 20% in the second year, and 5% each year after that makes it one of the highest return rates of all coins. This clone of Mintcoin is highly underrated, and only traded on a few exchanges now.
http://www.zeit-coin.net/
With a market capitalization just under $3 million dollars a week ago rising to $5,200,000 today, this coin has a lot of room to grow in value, making it head to the moon in percentage gain terms.
https://coinmarketcap.com/currencies/zeitcoin/
The rise in value has increased the coin's value by 150% in the past week.
This coin is riding on the gain in altcoins in general, and altcoins look to continue their trend higher towards the moon.
As altcoins grow in trading volume, rising above $105,000,000 market capitalization recently, coins like this one may gain traction in other exchanges helping add to the network effect.