this is a fantastic design! #75 clearly stands out. as an experiment, i suggest playing with a typeface, fix a kerning to make it more dense, maybe try small caps.
#110 font is better, i would still suggest making the wordmark more compact (with kerning). 'z' in color works better, i'd like people to see 'z' first, then arrows. blue+green looks great, though it falls out of the current color theme of my site (it's blue on light gray with some orange spots). a little suggestion: i'd like to see how other arrow heads will look like
i think that i will need some padding with this logo as i will need to use it on dark backgrounds as well.