Go for ETNX. Very high reward for now and easy to mine even just using spare laptops.
Where are you going to sell it? Do your research.
Are there at least 3 people with a wallet for the coin? Probably. Is one of those 3 people willing to serve as an escrow service? Possible. Congratulations, ETNX can be exchanged.
Sometimes the best and most profitable coins to mine are those not on any exchange.