Definately simplicity rather than complexity. It has to Work for different kind of usage and even though a complex logo can look very cool, it will end up having limitations in usage.
#82 Works better than #83 and with #84 it shows that it also Works in monocrome, which is great. #85 look is quite nice, but adds complexity to the text and makes it more difficult to make reverse colors like with
#82 and #54 where I can have two different backgrounds and the same expression. #86 is totally different in colors and I have to give that one some more consideration. Not instant fan of it.