XRB is the only one at this moment that imho needs to be bough.
Here is the ann: https://bitcointalk.org/index.php?topic=1381323.0 it's very poor as an ann, but if you read the blockchain lattice paper you will change idea about this coin.

Note that at the moment 70% of the community is made up of aggressive-Hindo people, but hope it will change soon..

Probably listed on bittrex soon.