The contenders are Dash and PiVX.
Well, Dash does a great job at advertising itself as privacy coin, but it should not be in the list. I won't say more because I would go off topic.
Grin, on the other hand, IS interesting and it could be soon quite a competitor for Monero.
Yes mate, Grin.
I forgot about that coin. It's the first ever altcoin that was accepted as payment in the forum for the Copper Membership and it took theymos' attention.