NEX (Nexus exchange) looks highly interesting.

also, incorporating level coin ideas is a plus....  This is an evolutionary landscape, things must evolve.  One project borrows DNA from another.

at the end of the day, one of the deciding factors is who can actually do this stuf f...  FrictionlessCoin seems like a good bet.  And, he's giving away NEX, so seems like a good deal to me.