#111 looks great, i have to convince my board now. before we finish, i'd suggest to put 'z' back in line, perhaps slightly rotated. decoration of 'z' is not visible, particularly at low resolution, maybe it makes sense just to add black lines on top and bottom of 'z' (or to the sides). please see what else you can do to make the logo cleaner and simpler
couple of technical questions:
1. will i have the file in a format that i can modify myself (i will not have to bug you with all this end less little modifications then)
2. i'll probably need some padding to put the logo on a dark background, what would you suggest?