Been believing with Monero to be the best privacy coin. I bought few months ago Pivx but when I saw it dropped, I started to think of a price that I'd sell it.
IIRC, I bought it around $1 - $1.5 and sold it back just for the break even. Can you give a reason why you don't like GRIN? it's the first altcoin to be accepted by the forum management when you will avail Copper membership.
I've been keeping an eye on the elixxir project...
Oh the project of David Chaum?