I vote for the upper right logo, the one with the   I   in the middle of the   0   Symbol.

I think the = will overload it just a bit. I also like the idea of some relief (although i am for the keep it simple way), but not as intense as in the examples, maybe reduce it in numbers, like clock digits positions or just something on top and bottom.

The reason i like the I in 0 is, that it is saying:


"This is a BINARY currency!"


http://s7.postimage.org/q8pde8d17/image.png